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Sump Plug thread
#11
The boiler stays on my 1920 Fowler steam roller are 3/4, 15/16 and 1 inch. All 14TPI whit form. 14 TPI is common on a lot of the fixings. Thankfully 5/8 _ 14 is BSF (I think)
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#12
Thank you everyone for your help on this, I didn’t know about Whitform threads.
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#13
Tracy tools are a good source of Whitform taps and dies.
Black Art Enthusiast 
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#14
Yes I’ve been looking at those, quite reasonable too
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