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Magical mystery fitting

SVDW
SVDW Member Posts: 80
This is installed on 2” DHW  line in a school built in the 50’s. No rating plate or rivet holes where there ever was one. Anyone have any idea what it might be? My guess so far is a thermosiphon recirc device or an exp compensator. Smartest piping guys in the world are on this forum.  Any of you seen this before? Thank you for your time! 

Comments

  • JUGHNE
    JUGHNE Member Posts: 10,320
    edited July 2022
    Strainer/filter???

    It would have most likely been plugged by now.

    Maybe the guts are out of it.
    Zman
  • PC7060
    PC7060 Member Posts: 912
    check valve?
    JUGHNEdelta Tmattmia2
  • Larry Weingarten
    Larry Weingarten Member Posts: 2,785
    edited July 2022
    Hi, it could be something unusual like magnetic water treatment… I think the only way to know for sure is to take the unions off, unbolt it and see what’s inside.

    Yours, Larry
  • Big Ed_4
    Big Ed_4 Member Posts: 2,075
    Check Valve upstream from the fire hydrant system ?
    I have enough experience to know , that I dont know it all
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 13,149
    Looks like maybe a packing joint on the left side. I would think it is an expansion device
  • PC7060
    PC7060 Member Posts: 912
    Open it! Open it!  :D
    mattmia2kcopp
  • rick in Alaska
    rick in Alaska Member Posts: 1,396
    I'm wondering if it is a flow restrictor? Is the packing gland on the side because it is set up like a dresser coupling for the copper pipe?
    Rick