Zerk Style Grease Fitting, Straight SKU ZERK-STRAIGHT $0.22 to $0.39 Quantity discounts available QuantityPrice (0)No Reviews yet Length - Fraction 17/32 45/64 15/16 Number of Pieces Item Custom Price Quantity -+ Add to Cart Details Grease zerk fittings work by acting as a one?way check valve that allows grease to pass through one way, but not the other. Inside the fitting is a ba... Details Back DetailsGrease zerk fittings work by acting as a one?way check valve that allows grease to pass through one way, but not the other. Inside the fitting is a ball check suspended by a spring. Ratings & ReviewsNo reviews availableBe the first to Write a Review