Allen screw size on MCDONNELL & MILLER 67 blow down valve

Old_Steam · March 8

Can anyone advise the size Allen key needed for the Allen head cap screws on the MCDONNELL & MILLER 67 blow down valve body? I have to remove some p[arts to get to it, and i want to make sure i have the right socket before i get into it.

Thanks

109A_5 · March 8

I believe it is 1/4 Inch. Stand by I'll check.

109A_5 · March 8

Yes, 1/4 Inch Hex. I checked the screws on my boiler and my spare stock.

109A_5 · March 8

I believe they have been shipping the units for decades with the 1/4 Inch hex drive cap screws. Yet the manual as of 2019 still refers to the old flat head screws.

Steamhead · March 8

I've seen both flathead and Allen screws in the field.

Old_Steam · March 10

https://forum.heatinghelp.com/discussion/comment/1890911#Comment_1890911

Thanks brother

Allen screw size on MCDONNELL & MILLER 67 blow down valve

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