What is this?

Plumbing Forums

Help Support Plumbing Forums:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

slink

New Member
Joined
Feb 7, 2020
Messages
1
Reaction score
0
Location
maine
This fitting is on my hydronic heating system before the expansion tank, what the heck is it for? Thanks21138-e4378c4802d7b7dfea2df4e5fb9bb6c7.jpg
 
Could be a flow control. If you just have circulator pumps they are installed to prevent heat migration before circulator had internal checks.
 
Back
Top