This consisted chiefly of the Delta line of shop tools and marked Rockwell's exit from the tool business. In 1984 Pentair purchased the remains of the Power Tool Division from Rockwell. The Porter-Cable name had been retired in 1965 but Pentair had not licensed the Rockwell name, so the Porter-Cable name was revived. Rockwell had purchased Porter-Cable in 1960 and merged it into the Power Tool Division but kept manufacturing in a separate facility.

In 1981, Pentair acquire Rockwell International's power hand tool factory from its Power Tool Division. Eugene Nugent was brought in to expand the management team. The Peavey plant would be sold in 1976 because Pentair had outgrown it. Miami Paper was purchased in 1974 and Flambeau Paper Corporation followed in 1978. It continued to expand in that area and acquired Niagara Paper in 1972. The company continued to diversify but none of its other ventures proved as successful as the paper industry. The company was deeply in debt and badly managed, but the sale price was very inexpensive and Harpole believed that proper management would turn the company around in short order. The only remaining founder, Murray Harpole, brought in an outside investor, Ben Westby and they set about purchasing Peavey Paper Mills, Inc. Of the five original founders, one had passed away while three more had pulled out. This venture also met with less than expected sales. They acquired a local vacuum-forming business shortly thereafter and set about making canoes. Originally, they intended to manufacture high altitude research balloons, but they found sales to be less than expected. The 5 founders were all formally employed by Litton Industries. Pentair was founded in August 1966 as Pentair Industries, Inc., with the name derived from the Greek root word 'penta-' (alluding to the company's five founders) and 'air' (alluding to the company's original product), and went public several months later. Its fiscal year 2021 revenues were US$3.8 billion and it employs approximately 11,250 people worldwide. Now the company's primary focus is on residential, commercial, industrial, municipal and infrastructure and agriculture applications. On April 30, 2018, PNR announced that it had completed the separation of its Water and Electrical businesses.

PNR was reorganized in 2014, shifting the corporate domicile from Switzerland to Ireland. Pentair was founded in the US, with 65% of company's revenue coming from the US and Canada as of 2017. Pentair plc ( PNR) is an American water treatment company incorporated in Ireland with tax residency in UK, with its main U.S.

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