Faucet Valve (3/4 inch) fits our GEM 5-gallon containers(nitromethane and alcohols). This faucet is made of Nylon and is compatible with HAZMAT and GEM products but NOT with Royal Purple drums. You can buy an empty drum and fill with the Royal Purple oil. Drill out the cap on our drums or order the vented cap and cut out the center section and this valve screws into the 3/4 inch tap. Tighten the cap with the Rieke wrench and you have a tight seal. Punch out the vent on the drum and then turn the drum on its side and you have a nifty additive or fuel filling station.