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QuickFitting 1/2 Inch Push to Connect Coupling | Patented Design for Superior Sealing | Push On Brass Plumbing Pipe Fitting | for Copper, PEX and CPVC | 5-Pack - Amazon.com
Smith Cooper 150# Black Malleable Iron 1 in. Banded Coupling Pipe Fittings - Threaded - John M. Ellsworth Co. Inc.
Pipe Fitting by Types - Types of Pipe Fittings, Thepipefittings.com
The Plumber's Choice 1/2 in. Straight Coupling Pipe Fittings Push to Connect PEX Copper CPVC Brass (5-Pack) 125UPSC - The Home Depot
Types of pipe coupling: Pipe Fittings - SMLease Design