stuart turner 501 boiler

stuart turner 501 boiler

This topic has 3 replies, 2 voices, and was last updated 6 September 2016 at 20:59 by phil burley.

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6 September 2016 at 19:40 #254454
phil burley
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@philburley12227
can anyone please tell me what the size and TPI is on the drain plug of a 501 boiler , The 504 is 5/16×26 but the 501 is smaller , I cant read my thread gauge as there doesn't seem to be enough threads to register on , or my eyesight isn't what it was !!!

thanks and regards Phil
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6 September 2016 at 19:40 #32774
phil burley
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@philburley12227
6 September 2016 at 19:52 #254456
JasonB
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@jasonb
My catalogue says a 1/4" check valve will fit in that hole for a feed pump but not what tpi, but I would think it is 32tpi
6 September 2016 at 20:59 #254463
phil burley
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@philburley12227
I would have expected that but the Kennings catalogue lists a check valve as 1/4 X 40 which I am sure doesn't fit the ST boiler
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