Oil Filler Cap Return Port

Cummins Oil Filler Cap w/ Swivel Return Port

Duramax Oil Filler Cap w/ Swivel Return Port

EcoDiesel 3.0L Oil Filler Cap w/ Swivel Return Port

Ford 6.0/6.4L Oil Filler Cap w/ Return Port and Oil Filter Cap w/ Pressure Port

Ford 6.7L Oil Filler Cap W/ Swivel Return Port

Toyota Oil Filler Cap W/ Swivel Return Port

VW, TDI, BMW, Audi, Mercedes, Sprinter Van Oil Filler Cap w/ Swivel Return Port (Version 1)