#67 LWCO Adapter

Big Ed_4

Do they still make that adapter that allows you to screw in an electronic probe after removing the float assembly ?

EBEBRATT-Ed

That would be a new one on me never herd of it.

109A_5

Hello @Big Ed_4,
Interesting, probably not hard to make.

Probably not a popular opinion, but I would rather have the float. My M&M 67 is probably over 50 years old, still works good.

109A_5

Hello @Big Ed_4,
Check out this probe type setup.
Go to 1:34 if you don't want to watch the whole video.
McDonnell & Miller 47-2ectomy & Installing A Hydrolevel Low ...
https://youtu.be/IThoboKgnes?t=96

Big Ed_4

I remembered seeing the adapter , I liked it..... I guess it did not make it on the shelf . I was thinking to go electronic . It is for a multi boiler hydronic manifold .. Thanks , I will use the 6667 .

109A_5

Hello @Big Ed_4,
You could slightly modify a Dirt Pocket Cap for the M&M 67 (remove metal at Orange dots) so longer screws (the same thread) for the float / switch assembly and flat washers will hold the Dirt Pocket Cap in place, that gets you a 3/4" Female pipe thread for a probe LWCO. The center diameter of the gaskets of each type is almost identical at 1-9/16" on each. Either gasket would probably work with slight modification.

BTW the Dirt Pocket Cap is very inexpensive.

109A_5

Hello @Big Ed_4,
So what is actually wrong with it ? Does it just need a good careful cleaning ? I clean mine.
Anyway, looks like all the individual parts are available.

SA67-2, Float & Bellow Assembly
https://www.supplyhouse.com/Mcdonnell-Miller-344200-SA67-2-Float-Bellow-Assembly

11, No.11 Switch Replacement
https://www.supplyhouse.com/Mcdonnell-Miller-309100-11-No-11-Switch-Replacement

11MV, MV Switch for 61, 64, 67, 69, 70, 764, 767
https://www.supplyhouse.com/Mcdonnell-Miller-309200-11MV-MV-Switch-for-61-64-67-69-70-764-767

67-12, Sylphon Gasket for 67 & 80
https://www.supplyhouse.com/Mcdonnell-Miller-318900-67-12-Sylphon-Gasket-for-67-80

Big Ed_4

This LWCO is not a #67 but uses a 6667 float assemble . I saw at a trade show or on a part counter , it was an adapter that screwed in to the McDonald Miller with a 3/4 tap ... I already figured why the part no longer exists ...

109A_5

Hello @Big Ed_4,
Well I was not looking for it any more but, I ran across this looking for something else. Seems odd to use the dirt pocket cap in the normal Dirt Pocket Cap position for a M&M #67 LWCO, seems that would be kind of low for proper boiler operation. I would think a special adapter cap (or plate) for a probe type LWCO would go where the float was.

Anyway;
https://www.supplyhouse.com/Generic-1751012-Dirt-Pocket-Cap-for-Low-Water-Cutoffs