Tompkins Industries unique Hydraulic Tank Cleanout Cover provides superior sealing, easy access, and lower maintenance costs. Its patented design is unique in the industry. It seals quickly with a full-torque, 1-bolt design. Trapezoidal design ensures even pressure and full 360° contact on the tank providing the maximum seal for your hydraulic and fuel tanks. The cover self centers and has an internal anti-rotation feature to prevent it from dropping during disassembly. You can use without risk of leaks or contamination above and below the fluid level. Assemble using hand tools or air impact wrenches.