... -Ring V-Ring.R-Ring. Y-Ring.U-Ring., Oil Seal,PU oil seals , rubber flat washers, rubber Circles, Gaskets, engine ... ,NSF ,ACS .WRC ,FDA ,UL ,KTW,W270, ROHS, SGS .5. Packing: neutral or as per client's requirement.6. Colour: red ... o-ring's mold fee is free. KTW standard rubber seal