PT Coupling is the leading manufacturer of cam and groove style hose couplings. Their products, including Punch-Lok Hose Clamps, small brass fittings, couplings for industrial applications, and ProGrip Couplers are distributed worldwide. Their goal is to deliver the best quality and service to their customers.

PT is a subsidiary of Parrish Enterprises Ltd., which began as a family business in 1951, founded by R.C. Parrish. He formed the company as a jobbing machine shop, but later recognized that manufacturing a set product line would be the key to building a strong reputation, and ensuring the company's long-term success. At that point he started producing the cam and groove style hose couplings.

In the early 1970s, PT needed to improve the quality of its castings, so a decision was made to develop a foundry for producing ferrous and non-ferrous castings. This decision brought immediate results and a dramatic improvement in quality of the products.

Today, PT Coupling's family history is well preserved by their president Jim Parrish, who is one of RC's two sons. The Parrish family is proud to carry on the values, traditions and commitment to the customer that RC started over 50 years ago. PT Coupling manufactures and distributes high quality quick connect / disconnect couplings and replacement parts. They continually strive to provide these products at a competitive price, with on time delivery, and with the highest standards of customer service. In October of 2001, PT Coupling received ISO 9001 Certification.