Pentair
Global water-treatment, pool, fluid-management, and pumping-solutions company
Last updated October 15, 2026
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Overview
Pentair plc is a publicly traded water and fluid-solutions company whose principal businesses serve residential, commercial, industrial, municipal, infrastructure, agricultural, and pool-related applications. Although the company is incorporated in Ireland and has UK tax residency, it was founded in the United States and maintains a major U.S. office in Golden Valley, Minnesota. Its historical development illustrates a substantial transformation from a diversified industrial group into a focused water-technology company. Pentair began in August 1966 as Pentair Industries, Inc. The name combined “penta,” referring to the five founders, with “air,” reflecting the founders’ initial interest in high-altitude research balloons. That first concept did not generate the expected demand, and the young company experimented with vacuum-formed products and canoes. By 1968 it was close to failure. Murray Harpole, the only founder still actively involved after the departure or death of the other original participants, brought in investor Ben Westby and redirected the business toward Peavey Paper Mills. Pentair subsequently built a paper-products platform through acquisitions including Niagara Paper, Miami Paper, and Flambeau Paper. The company diversified again during the 1980s. It acquired Rockwell International’s power-tool manufacturing operation in 1981 and later obtained the Delta shop-tools business, reviving the Porter-Cable name in the process. In 1988, its acquisition of FC Holdings added Federal Cartridge and Hoffman Engineering. Hoffman became especially important because it established a durable position in electrical and equipment enclosures, while Federal Cartridge was eventually divested. Water became increasingly central during the 1990s and 2000s. Pentair acquired Fleck Controls, a control-valve business used in water treatment, and General Signal’s pump group. In 1999 it purchased Essef, a major supplier of composite tanks, pumps, filters, and pool-and-spa equipment. The company also acquired WICOR Industries in 2004, bringing the Sta-Rite, SHURflo, and Hypro water brands into the portfolio. It exited power tools in the same year by selling that operation to Black & Decker, later Stanley Black & Decker. Additional transactions expanded Pentair’s wastewater, environmental equipment, pressure-vessel, filtration, and thermal-management capabilities. A major structural change occurred in 2012, when Pentair combined with Tyco International’s flow-control business. The resulting Pentair Ltd. broadened its portfolio to include water and fluid solutions, valves and controls, equipment protection, and thermal-management products. The enlarged company was initially based in Switzerland. It later reorganized its legal domicile, moving from Switzerland to Ireland in 2014 while maintaining UK tax residency. In 2017 Pentair completed the sale of its Valves & Controls business to Emerson, reducing its exposure to general industrial flow control. In 2018 Pentair separated its electrical business into nVent, a separately listed company. The separation left Pentair primarily focused on water-related activities, including residential and commercial water treatment, pumps, pool equipment, filtration, wastewater, and related services. Pentair subsequently strengthened its pool and commercial-ice presence through the 2022 acquisition of Manitowoc Ice. The company describes its current scope around water quality, water movement, water treatment, and equipment serving homes, businesses, industries, municipalities, infrastructure projects, and agriculture. The business has a particularly strong North American base, with the United States and Canada representing the majority of revenue in the historical period cited by reference material, while its products and brands are sold internationally.
History
Pentair was established in August 1966 as Pentair Industries, Inc. by five former Litton Industries employees. The founders initially intended to manufacture high-altitude research balloons. Weak demand forced a rapid change of direction, first toward vacuum-formed products and then canoes. Neither activity performed as hoped, and the company approached bankruptcy by 1968. Murray Harpole, the remaining active founder, obtained support from investor Ben Westby and acquired Peavey Paper Mills, a heavily indebted but inexpensive paper business. Paper became Pentair’s initial operating foundation. The company acquired Niagara Paper in 1972, Miami Paper in 1974, and Flambeau Paper Corporation in 1978. During this period Pentair also rebuilt its management structure, including the addition of D. Eugene Nugent after Westby’s departure. Although the company continued to investigate other activities, paper remained its strongest business and provided the platform for later diversification. Pentair entered power tools in the 1980s. In 1981 it bought Rockwell International’s power-tool factory and revived the Porter-Cable name. In 1984 it acquired the remaining assets of Rockwell’s power-tool division, principally the Delta shop-tools line. The 1988 purchase of FC Holdings added Federal Cartridge and Hoffman Engineering. Hoffman’s equipment-enclosure activities became a significant part of Pentair’s industrial development, whereas Federal Cartridge was not retained permanently. The company’s later strategy increasingly emphasized water. In 1995 it acquired Fleck Controls, whose control valves were used in water-treatment systems, followed by General Signal’s Pump Group in 1997. Pentair sold its paper business to Consolidated Papers in 1997, a decisive step away from its original core. In 1999 it purchased Essef, a supplier of composite water tanks, pumps, filters, and pool and spa equipment. It also acquired DeVilbiss Air Power, adding compressors, pressure washers, and generators to its power-tool ecosystem. The beginning of the 2000s exposed the operational risks of Pentair’s tool-business expansion. The opening of a consolidated office and distribution facility in Jackson, Tennessee, created severe fulfillment problems. Orders were delayed, shipped incorrectly, or not shipped, leading to customer complaints, falling sales, and high returns. Management changes and several years of operational repair followed. Pentair expanded production in Taiwan and eventually closed the Delta facility in Tupelo, Mississippi, after labor negotiations failed. Water nevertheless continued to expand. In 2004 Pentair acquired WICOR Industries for approximately $850 million, obtaining the Sta-Rite, SHURflo, and Hypro brands and adding pumps, filters, and pool-equipment components. Pentair sold its entire tool operation to Black & Decker later that year, completing its exit from power tools. Acquisitions of APW assets in 2005 added thermal-management and technical products, while Jung Pumpen, acquired in 2006 and completed in 2007, strengthened wastewater capabilities. Other transactions added environmental equipment, pressure tanks, filters, and water-treatment assets in North America and China. In 2012 Pentair combined with Tyco International’s flow-control business. The enlarged Pentair Ltd. operated internationally across water and fluid solutions, valves and controls, equipment protection, and thermal management. The company was initially based in Schaffhausen, Switzerland, and later moved its corporate domicile to Ireland in 2014 while maintaining UK tax residency. In 2017 it completed the sale of Valves & Controls to Emerson. Pentair separated its electrical business in 2018, creating nVent as a separately listed company. This left Pentair with a more concentrated water platform covering residential, commercial, industrial, municipal, infrastructure, and agricultural uses. In 2022 it acquired Manitowoc Ice, broadening its offering into commercial ice equipment. Pentair’s present identity is therefore the result of a long shift from balloons, paper, tools, and diversified industrial products toward water treatment, pumping, pool technology, wastewater, and related equipment.
- 2022
Manitowoc Ice acquisition
[1]Pentair acquires Manitowoc Ice and adds commercial ice-making equipment to its portfolio.
- 2018
Electrical business separated into nVent
[1]Pentair completes the separation of its electrical business, leaving the company focused primarily on water-related activities.
- 2017
Valves & Controls sale completed
[1]Emerson completes its acquisition of Pentair’s Valves & Controls business.
- 2014
Corporate domicile moves to Ireland
[1]Pentair reorganizes its legal domicile from Switzerland to Ireland and retains UK tax residency.
- 2012
Combination with Tyco flow control
[1]Pentair combines with Tyco International’s flow-control business to create a larger global industrial and water-solutions company.
- 2006
Jung Pumpen acquisition
[1]The purchase expands Pentair’s wastewater and sewage-pumping capabilities in Europe.
- 2004
WICOR acquisition and tool-business exit
[1]Pentair buys WICOR Industries and its Sta-Rite, SHURflo, and Hypro brands, then sells its power-tool operation to Black & Decker.
- 1999
Essef acquisition
[1]Pentair acquires Essef, adding composite water tanks, pumps, filters, and pool-and-spa equipment.
- 1997
Pentair sells paper business and acquires General Signal Pump Group
[1]Pentair simultaneously reduces its historical paper exposure and expands its pump and water-products platform.
- 1995
Fleck Controls acquisition
[1]The acquisition adds control-valve technology used in water-treatment systems.
Products and positioning
Water-focused engineering and equipment provider combining pumps, filtration, treatment, pool technology, wastewater systems, and commercial ice solutions for residential, commercial, industrial, municipal, infrastructure, and agricultural users.
Residential and commercial water treatment
Pentair Water Treatment
Pentair’s water-treatment portfolio includes filtration, conditioning, control, and separation technologies for homes, businesses, and institutional users. Products are designed to improve water quality, manage contaminants, and support reliable water delivery in applications ranging from residential treatment to commercial and industrial systems.
Pool equipment and automation
Pentair Pool
The pool business covers pumps, filters, heaters, automation, water-care products, and related equipment. It serves residential and commercial pools and combines mechanical circulation with treatment and control functions intended to improve energy efficiency, water quality, and ease of operation.
Pumps and pool equipment
Sta-Rite
Sta-Rite is a Pentair water-equipment brand associated with pumps, filtration products, and pool systems. It entered Pentair through the WICOR acquisition and contributes products for water movement and treatment in residential, agricultural, commercial, and pool applications.
Specialty pumps
SHURflo
SHURflo supplies compact and specialty pumping products used in mobile, agricultural, recreational, commercial, and water-management applications. The brand became part of Pentair through the 2004 WICOR transaction.
Agricultural and specialty pumping
Hypro
Hypro is associated with pumps and fluid-handling components, particularly for agricultural spraying and other demanding specialty applications. Its inclusion in the WICOR portfolio strengthened Pentair’s presence in professional fluid-delivery markets.
Wastewater and sewage pumps
Jung Pumpen
Jung Pumpen develops pumps and systems for wastewater, sewage, drainage, and related building-services applications. Pentair acquired the Germany-based company in the mid-2000s to expand its European wastewater capabilities.
Commercial ice equipment
Manitowoc Ice
Manitowoc Ice produces commercial ice-making equipment for foodservice, hospitality, healthcare, retail, and other professional environments. The brand joined Pentair through the 2022 acquisition and complements the company’s broader focus on water-dependent equipment.
Controversies
2026
Pentair sued in securities fraud class action over pool inventory disclosures
A securities fraud class action was filed against Pentair plc and certain senior executives in the U.S. District Court for the Southern District of New York. The suit alleges the company misled investors about its pool inventory, leading to a 15% stock drop and the abrupt departure of Pentair's CFO. The case is captioned Walters v. Pentair plc, No. 26-cv-6632, with a lead plaintiff deadline of October 2, 2026.
Brand decisions
2022
Acquisition of Manitowoc IceM&ABackground
Pentair sought to broaden its equipment portfolio in water-dependent commercial applications.
Action taken
Pentair acquired Manitowoc Ice.
Aftermath
The acquisition added commercial ice-making equipment and expanded Pentair’s presence in foodservice and hospitality-related equipment markets.
2018
Separation of the electrical business into nVentStrategyBackground
Pentair’s electrical and equipment-protection activities represented a distinct business platform from its water operations.
Action taken
Pentair separated the electrical business into nVent, which became a separately listed company.
Aftermath
Pentair emerged as a more focused water-solutions company serving residential, commercial, industrial, municipal, infrastructure, and agricultural markets.
2017
Sale of Valves & Controls to EmersonM&ABackground
Pentair reassessed the fit of its flow-control activities within a company increasingly centered on water technologies.
Action taken
Pentair agreed to sell Valves & Controls to Emerson; the transaction was completed in April 2017.
Aftermath
Pentair became more concentrated in water and adjacent equipment, while Emerson expanded its industrial automation and flow-control portfolio.
2012
Combination with Tyco International’s flow-control businessM&ABackground
Pentair sought greater international scale and a broader portfolio spanning water, fluid handling, valves, controls, equipment protection, and thermal management.
Action taken
Pentair combined with Tyco’s flow-control business to form the enlarged Pentair Ltd.
Aftermath
The transaction created a multinational company with a significantly broader industrial footprint, although Pentair later divested Valves & Controls and separated the electrical business.
2004
Exit from the power-tool businessStrategyBackground
Pentair’s power-tool operations had encountered distribution and profitability problems, while the water-products business was becoming strategically more important.
Action taken
The company sold its entire tool operation to Black & Decker, completing its withdrawal from power tools.
Aftermath
The transaction redirected Pentair’s investment and acquisition strategy toward water treatment, pumps, pool equipment, and related fluid technologies.
Recent events
- 2022
Pentair acquires Manitowoc Ice[1]
M&A
Pentair announced the acquisition of Manitowoc Ice, adding commercial ice-making equipment to its water and foodservice-related portfolio.
- 2018
Pentair separates its Water and Electrical businesses[1]
M&A
Pentair completed the separation of its Water and Electrical businesses. The electrical business became nVent, while Pentair continued as a more focused water-solutions company.
- 2017
Emerson completes acquisition of Pentair Valves & Controls[1]
M&A
The sale of Pentair’s Valves & Controls business to Emerson was completed, reducing Pentair’s exposure to that industrial segment.
- 2016
Pentair agrees to sell Valves & Controls to Emerson[1]
M&A
Pentair announced an agreement to divest its Valves & Controls business to Emerson as part of a portfolio-refocusing effort.
- 2014
Pentair changes corporate domicile from Switzerland to Ireland[1]
Other
The company reorganized its legal structure and shifted its corporate domicile from Switzerland to Ireland while retaining UK tax residency.
- 2012
Pentair combines with Tyco flow-control business[1]
M&A
Pentair and Tyco International combined Pentair with Tyco’s flow-control operations, creating a larger company spanning water and fluid solutions, valves and controls, equipment protection, and thermal management.
Sources10 sources
- 1Pentairen.wikipedia.org
- 2Pentair sued in securities fraud class action over pool inventory disclosuresprnewswire.com
- 3Pentair Earns 2020 ENERGY STAR Partner of the Year - Sustained Excellence Awardfinanznachrichten.de
- 4Pentair Earns 2021 ENERGY STAR Partner of the Year - Sustained Excellence Awardfinanznachrichten.de
- 5Pentair Introduces Q1 & FY21 Guidancefinanznachrichten.de
- 6Pentair plc: Pentair Appoints Melissa Barra to Board of Directorsfinanznachrichten.de
- 7Pentair plc: Pentair Completes Acquisition of Roceanfinanznachrichten.de
- 8Pentair Withdraws Q1, FY20 Guidance Amid COVID-19finanznachrichten.de
- 9PPL Electric Utilities earns 2021 ENERGY STAR® Partner of the Year Awardprnewswire.com
- 10Welltower Earns 2021 Energy Star® Partner Of The Year Award And Is Recognized For Sustained Excellence By The Environmental Protection Agencyprnewswire.com
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