EZ-FLUID Plumbing 1-1/4" C X C LF Copper Slip Coupling Pressure Copper Fitting Without Stop,Sweat Solder Connection for Residential,Commercial. (1 Pack) - Amazon.com
Amazon.com: 1/2" Slip Coupling U3008LF with Disconnect Clip - Push to Connect Plumbing Supplies - Lead-free Brass Fittings for Copper, PEX, CPVC, HDPE and PE-RT (pack of 2) : Industrial & Scientific
10pcs) EZ-FLUID Plumbing 1/2" C X C LF Copper Slip Coupling Pressure Copper Fitting Without Stop,Sweat Solder Connection for Residential,Commercial - Amazon.com
RLS 1-1/8" Braze-Free Slip Coupling
How to use slip couplings to tee into a rigid copper pipe - YouTube