For ease of draining the fuel bowl of your Zenith or Marvel Schebler come the end of the season, our 1/8" NPT petcock is the ticket! Don't leave fuel in the fuel bowl over the Winter months especially if the fuel you use has Ethenol in it. Ethenol seperates from the fuel and causes muck in the bottom of the fuel bowl. If the Tractor is going to sit for any length of time no matter what the season, drain the fuel from the bowl and dump it back in the tank. Always treat your fuel tank with Dry Gas to keep water to a minimum!