Gas tank has a left side petcock opening. It features a pop-up style gas cap, and flush lower mounts. This Wyatt Gatling tank has a 4" stretch to the back of the tank which does not affect the mounts. The underside of the tank will accept 1/8" National Pipe Thread hose barb fittings for the fuel crossover line. Check the tank for flaws and fit before painting. Do not grind or sand the seams or joints. Clean the inside of the tank. It is suggested to pressure test and use a tank sealer. We suggest using Kreem gas tank combo kit to clean, condition and seal to help stop leaks and prevent corrosion. Check petcock opening, making sure the petcock can be easily installed. Petcock fitting should be masked or plugged during painting for easy installation of the petcock.