Mechanical Seal Rubber dust seal 1. Material: PU, Epdm 2. Color: red, black, ... . Hydraulic seals usually need to be higher friction seals than pneumatic seals but often operate under lower operating speeds.3) The ... , NCF, ROI, SPNRI, WR, BRT, RYT, DB, TAY, VB, TC Pneumatic Cylinder appropriative seal:PGY, PNY, GLY, PSD, PDU, PPY, PRY ...