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We have been running road tests on this aluminum bodied, 3-port WVO/SVO 12-volt fuel tank selector valve (also available in 24-volt) with easily-replaceable Viton seals. It has 12-mm ports with 1/2 inch NPT threads, a maximum operating temperature of 212° F, it is a bubble-tight valve (which means it is not going to leak like some of the other valves used for WVO) and it even has a small red light that tells you when you have switched to WVO! We have run this valve in VWs, Mercedes, and larger pickup trucks with good results.