1.PP Compression Reducing Coupling 2.Type I /blue,black 3.PN10/PN16 4.20* ... iron pipe and fittings, or PVC pipe and fitting, or PPR pipe and fitting, or any other sort of products, you ... equal tee, PP 90 degree elbow, 45 degree elbow, PP coupling, PP male adaptor, PP female adaptor, PP saddle, etc. Pressure ... and compensate the part of loss to you . PP Compression Reducing Coupling