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What is this?

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Zman
Zman Member Posts: 7,589
This might be a super simple question. The photo is a non-potable connection on a composting toilet. What is it called and how do I connect to it?
TIA

"If you can't explain it simply, you don't understand it well enough"
Albert Einstein

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  • mattmia2
    mattmia2 Member Posts: 9,850
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    Looks like that standard flat flanged tubing with a washer and nut connection that any toilet uses but left hand thread on the nut.
  • hot_rod
    hot_rod Member Posts: 22,396
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    Called a bulkhead fitting, they come in all different sizes. It may be an odd thread, usually they have an NPT internal thread.
    looks like the external thread is stepped, maybe for a toilet ballcock nut? Or standard lav faucet nut?
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • mattmia2
    mattmia2 Member Posts: 9,850
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    hot_rod said:

    Called a bulkhead fitting, they come in all different sizes. It may be an odd thread, usually they have an NPT internal thread.
    looks like the external thread is stepped, maybe for a toilet ballcock nut? Or standard lav faucet nut?

    If i'm not mistaken, it is left hand thread. That might be part of the nonpotable code.
  • Larry Weingarten
    Larry Weingarten Member Posts: 3,364
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    Hi @Zman , It's hard to tell, but it looks like it might be threaded on the inside as @hot_rod says. If so, you may have an easy right-hand thread to play with. Tightening that thread would only snug the exterior left hand thread, so no leaks happen.

    Yours, Larry
    mattmia2
  • mattmia2
    mattmia2 Member Posts: 9,850
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    i missed the "hey is it threaded inside" part.
  • Zman
    Zman Member Posts: 7,589
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    It is not threaded on the inside but it might allow for an internal glue connection. It is the domestic connection for a large composting toilet.
    https://clivusmultrum.com/
    I may need to call them in the morning.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • hot_rod
    hot_rod Member Posts: 22,396
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    Zman said:

    It is not threaded on the inside but it might allow for an internal glue connection. It is the domestic connection for a large composting toilet.
    https://clivusmultrum.com/
    I may need to call them in the morning.

    Yes you can get glue type also. Usually the connection is made inside due to the left hand thread on the nut.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream