I'm re-sealing the engine cooling intake thru-hull. What should I use to seal the threads when I install the valve on the thru-hull? Teflon tape, plumber's putty, 5200?
Thanks.
Thanks.
What thread sealer?
- Thread starter IH82BL8
- Start date
I use Herculese/Oatey Real-Tuff available at any Home Depot.
Just be aware that an NPT valve to an NPS thru-hull fitting is a thread mis-match...
How about sealing the Marelon threads (between a through-hull and the valve)? The through-hull part is solid (good seal and good backing plate). The issue is the seal between the threads (and they do match).
I clarified the sealant for Marelon with Art Bandy of Forespar a few months ago - he indicates to "Use pipe dope or Teflon tape on all threads."
I prefer the thicker Teflon tape available at most Hardware stores, MaineSail refers to this in a previous thread.
Been a water & sewage system engineer for twenty years. Just completed sophisticated regional septic pumping system and found a few things. 1.) To pass the plumbing union local's test, you must use both pipe dope and teflon tape in your threaded joint test. 2.) There is a new, grey-colored Teflon tape, created for stainless steel threads - some models with included nickel particles to permit transmission of eddy/ripple-current (similar to dielectric couplings in steel/copper networks.) You can use this thicker tape in all threaded applications 3.) We were pressure-testing to 120 PSIG, holding a buried 4" plastic pipe over 300 feet long to less than half a pint of leakage in an hour. We discovered the Chinese-manufactured 1/2 inch ball valves in the test rig failed with virtually undetectable cracks in their housings (tests failed daily for three weeks before cracks were found) which leaked in a very fine spray, seen only as rainbow in direct sunlight. Replaced with old-fashion bonnet in-line valves and each section passed first time. Do not skimp on valve costs - especially below the waterline. I intend to not use ball valves in the Electra.