Copper Inserts | EP12CI1 4 pack Size: ½" Easi Plumb 1/2'' Copper Inserts Pack Of 4 | 0120-43 The Easi Plumb Brass Compression Copper Insert Pipe Fitting 1/2'' - 4 Pack is a high quality brass compression fitting, manufactured to ISEN 1254-2 standards. This brass fitting is for indoor use and is used to provide rigidity to the pipe when put under pressure. This is a simple to assemble compression joint, manufactured using quality brass.