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Aug 6, 2017
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Norfolk
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Is there a benefit of using one over the other on radiator tails? Only ask as I have a couple of cast iron rads to fit and manufacturer says LSX over PTFE
 
Ptfe tape at correct amount and smear of paste will never leak on typical rad threads and rad valve tails.
Not arguing that Loctite 577 isn't better, but just wonder why you would have the need to use it on threads that are certain to seal with tape, unless you are putting the tape on wrong, - usually too little.
 
Isn't lsx just silicone sealant?

Ptfe for me, if it's not sealing with ptfe then the problems with the fittings. Avoid ptfe and oil based joint compound, the compound can attack the tape.
 
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Isn't lsx just silicone sealant?

Ptfe for me, if it's not sealing with ptfe then the problems with the fittings. Avoid ptfe and oil based joint compound, the compound can attack the tape.
I have had a couple of tails going into towel tails that I have had to use gas PTFE to get them to seal. But to be honest I think that was the finish on the rad and less to do with the PTFE
 
And small amount of threads on towel rail also a problem to seal with ptfe tape. Unless the tail has a shoulder to tighten against the towel rail, or the tails with the rubber seal
 
And small amount of threads on towel rail also a problem to seal with ptfe tape. Unless the tail has a shoulder to tighten against the towel rail, or the tails with the rubber seal
Somebody else has said about the tail with a seal but I have only seen the extensions with a seal. Got a link?
 

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