Anyone identify this main vent ?

ratherbfishing

For curiosity, anyone know what type of vent this is?

KC_Jones

It's a radiator vent. The format indicates either a Gorton or Maid O Mist. There will be stamped lettering on the other side that will tell the whole story.

ratherbfishing

Other side is blocked. I couldn't tell from the inlet because it's an odd shape. Maid o mist and gorton look slightly different in that regard

Chris_L

Looks like a Gorton. Maid O' Mists vent through the top of nub. Gortons though the back side of the nub—through the hole in the photo (and leave a mark on my white radiators).

ratherbfishing

I think you're correct. MoM have that screw on vent

Waher

it’s a Gorton radiator vent threaded into a street elbow

ratherbfishing

Probably a D given it's a rad vent

Steamhead

https://forum.heatinghelp.com/discussion/comment/1876528#Comment_1876528

Given the size of the hole, I think you're right.

Nothing wrong with doing it this way, as long as the vent is adequate for the main it's on. @ratherbfishing , how long is that main, and what pipe size?

ratherbfishing

@Steamhead it's the short main. 26 feet, one 90 degree turn, 2.5 in

Steamhead

That should work fine. If the other main is longer it needs more venting.