Tanks are for indoor or outdoor, stationary or transportable applications. Furnished with 4 each 1/4-20 aluminum inserts on the bottom to facilitate anchoring. Sump on the bottom for fitting installation. Typically used as a fuel tank on power equipment. UV stabilized. Black in color. 2" vented cap. Must be securely anchored in transportable applications. Specific gravity of 1.7. Product is not furnished with user warning labels for fuel containment applications. Fittings have Viton™ O-rings. 6 gallon 15" L x 10" W x 10" H; cap is near end of tank. 12 gallon 18" L x 14" W x 12" H; cap is in middle of tank. Dimensions do not include hgt of cap.