Riser venting

Ldallas_87

I live in a 6 floor Co-Op building that has risers in the bathroom and kitchen. They had angle Gorton D vents on them and a plumber came in today and installed a 1/8 x 3/4 elbow with a MoM #1 straight main vent on both.
 Aside from the downgrade in quality, I’m curious, is there any difference in venting or function by installing it this way? From what I understand Gorton D, and MoM/Gorton # 1 have the same venting capacity so I’m trying to wrap my head around it. 

Also, is there any possible test/way to find out if a main feeds a radiator? I’m trying to find out if that bathroom riser feeds the radiator in my bedroom which is on the other side of that wall. 

ethicalpaul

What makes you think there's a downgrade in quality? I've seen a lot of anecdotes about MoM vs Gorton, but no data so far. D and #1 of MoM and Gorton are the same size.

If the pipe gets hot above the vent, you can be pretty sure there is a vent above it, likely on a radiator. What floor are you on?

If you want a little more heat in that bathroom, remove the rope.

PC7060

What does valve on lower right side of door control?

Ldallas_87

Just the crimped construction and plastic float. I’ve also had one leaking from the crimp joint but aside from that, I am on the top floor. The rise ends in my apartment. 

That valve in the picture is a water shutoff valve. 

ethicalpaul

Why don't you like the plastic float? It doesn't rust.

The rise ends in your apartment, you mean your apartment is on the top floor? Then I think it's strange that the pipe goes through the ceiling.