Stripped exhaust drain plug threads

[waterlogged882]

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[88 PS190]

Agreed, I've been planning this same project just to get more threads engaged, mine only thread in about 1.5 threads.

[waterlogged882]

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[Ski-me]

OK, I now also have the same problem. I'm trying to determine if the 3/4 NTP is the same thread size/pitch as the 3/4" galvanized plug at Lowes (or the 3/4" gas black pipe). The threads line up with my old plug. I just want to make sure before trying to get these one.

I couldn't find a brass fitting (tee, reducer) to match the same thread pitch. The ones I found were more coarse.....like a hose type thread. I saw a lot of MIP type threads, but no NTP's.

Does Lowes/HD have a 3/4" tap this size? Is it a common one?

[Spork]

Originally Posted by Ski-me

OK, I now also have the same problem. I'm trying to determine if the 3/4 NTP is the same thread size/pitch as the 3/4" galvanized plug at Lowes (or the 3/4" gas black pipe). The threads line up with my old plug. I just want to make sure before trying to get these one.

I couldn't find a brass fitting (tee, reducer) to match the same thread pitch. The ones I found were more coarse.....like a hose type thread. I saw a lot of MIP type threads, but no NTP's.

Does Lowes/HD have a 3/4" tap this size? Is it a common one?

NPT (national pipe thread) is what you need, yes any big box store should have the plugs and taps.

[Footin]

I had the same problen a few years back, I chased the threads with a 3/4 NPT tap then installed 1/4 turn ball valves on each side. Now when I winterize I just turn the valves to drain, no more removing the plugs.

[blakekrone]

Originally Posted by j.mccreight@hotmail.com

NPT (national pipe thread) is what you need, yes any big box store should have the plugs and taps.

On the contrary none of the big box stores here in my area had NPT plugs nor taps. I ended up getting plugs from the local MC dealer and Northern Tool had a tap set that included the 3/4" I needed.

[Spork]

Find a sears hardware, they should have them...

[JimN]

Originally Posted by Ski-me

OK, I now also have the same problem. I'm trying to determine if the 3/4 NTP is the same thread size/pitch as the 3/4" galvanized plug at Lowes (or the 3/4" gas black pipe). The threads line up with my old plug. I just want to make sure before trying to get these one.

I couldn't find a brass fitting (tee, reducer) to match the same thread pitch. The ones I found were more coarse.....like a hose type thread. I saw a lot of MIP type threads, but no NTP's.

Does Lowes/HD have a 3/4" tap this size? Is it a common one?

Look at a piece of threaded black pipe- the thread is tapered, to ensure a good seal when it goes into a fitting.

Go to an ACE hardware store- they have a set of sliding panels with bins, filled with brass fittings.

[Ski-me]

Originally Posted by JimN

Look at a piece of threaded black pipe- the thread is tapered, to ensure a good seal when it goes into a fitting.

Go to an ACE hardware store- they have a set of sliding panels with bins, filled with brass fittings.

So, if it's tapered, will a 3/4" -14 tap work to clean out the threads?? I'll check out Ace today if I can break away......

The plug I pulled out matches the black pipe but whose to say the old one is correct. I guess I'll have to assume it is after all these years.