The 1/4-inch Copper Pressure Coupling with Stop C x C is used above-ground and below-ground. The 1/4 inch Copper Pressure Coupling is for water supply piping and relies on pressure to maintain water flow.
Fitting ID Size: 1/2'' (OD 5/8''), Fitted Pipe ID Size: 3/8'' (OD 1/2'')
Joins straight lengths of copper tubing
For use with type M and type L hard temper copper tubing