The EBW® brand sealing dip cap prevents the overflowing of a tank through uncapped tank dipstick risers. The 3" sealing dip cap incorporates a spring-loaded, self-closing internal valve which seals when the sealing cap is removed and the dipstick is not in place. This innovative safety feature provides overflow protection whether the sealing cap and the dipstick are removed, or the sealing cap is in position with an attached dipstick stored in the tank.