On the top of the converter you will see approx 19 mm. Bolt head with a Phillips head slot in it make sure you bleed the gas out of the line before you undo it. Also there is a o ring on it don't loose it as it will leak gas when you put it back try to get a gauge that goes to apply 40 to 50 psi just in case the converter is bad the pressure could spike see if you can find an lpg gauge you might have to adapt a fitting to go into the thread of the converter if you can't than l have used a hyd gauge but it won't last long. Get back to me.