I used pipe sealant on mine - no problems so far.GPO03FatBoy said:The choices on this one are thread sealant or a wrap or two of Teflon tape. It needs something or it will leak! Like YankeeBob said, you have to stay away from the opening/first thread or risk a blockage. Between the first thread or two and the fact that the tape gets cut by the threads anyway, it will make good electrical contact. The instructions call for sealant. That always makes more of a mess for me than a clean wrap of the tape.