www.phcppros.com/articles/5871-john-guest-usa-prolock-male-connectors

John Guest USA ProLock Male Connectors
August 21, 2017
Designed for use in the Plumbing Market, the new ProLock Male Connectors are available in 3/8 inch CTS X ½ inch NPT to 1 inch CTS X 1 inch NPT sizes. These Male Connectors simplify installations and are ideal for under the counter filter housings. Its body is manufactured from high quality engineered black thermoplastic allowing the male connectors to be UV resistant outdoors as well. These fittings are suitable for use with copper, PEX or CPVC pipe. Quick and easy, ProLock require no tools to make secure, leak-proof connections. The Connectors are also lead-free and carry a 25-year warranty.
John Guest
Learn more about the connectors on John Guest’s website.