Flexi tube--does it need sediment trap?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Deb2429, Nov 30, 2008.

  1. Deb2429

    Deb2429 New Member

    Messages:
    3
    I installed a new water heater. To make things easy I used the yellow flexi tube to connect the gas line. I have read however from the manufacturer that the water heater gas line needs a sediment trap. Is this true if you use the flexi tube? SHould I go back to the black pipe?

    Debbie
  2. tl2tl

    tl2tl New Member

    Messages:
    30
    I've seen flex gas connectors looped so that the loop is below the connection to the heater and acts as a sort of sediment trap.

    However, I would keep the sediment trap, since it's as easy to get a shorter flex connector and loop it so that one side connects to the heater and the other to the black "T" with the existing sediment trap.

    Your dimensions and distances may be different, but here's a picture where I've penciled in one possible way to connect the flex line, while at the same time keeping the sediment trap intact.

    [​IMG]
    Last edited: Nov 30, 2008
  3. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,395
    Location:
    Yakima WA
    There does need to be a trap, but that would not affect the use of the flex line. In the illustration in the previous post, you can see there is a trap in the tee leading to the heater. If I was doing that install, I would have used a flex line rather than the solid pipe, but it would be the same basic setup.
  4. kingsotall

    kingsotall Plunger/TurdPuncher

    The sediment trap is before the flex line connecting the water heater. Now is it required¿ Dunno, did you get a permit and is the inspector scheduled¿ if yes, then yeah, pipe a sediment trap.
  5. Deb2429

    Deb2429 New Member

    Messages:
    3
    flex

    thanks for all the help. I put the black pipe trap back in, connected to heater with black pipe (where Terry drew his flex line) and use the flex on top on "t" to connect to gas line--that works right?

    Deb
  6. tl2tl

    tl2tl New Member

    Messages:
    30
    Yes, that sounds good.
    Just double check all the connections for any leaks.

    ...BTW, I'm not Terry but that's ok :)
    Last edited: Nov 30, 2008
  7. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,235
    Location:
    Cave Creek, Arizona
    trap

    Here, dirt traps are not required and I have not seen or installed one in over 30 years. IF you need a trap, you need it regardless of how the connection is made. In the above picture, the question could be asked, "WHO connects the gas line to a water heater control valve without a union between the tee and the thermostat?"
  8. Deb2429

    Deb2429 New Member

    Messages:
    3
    why union?

    why would you need a union? and where would it go? short black pipe/union/then black pipe to the thermostat?
  9. tl2tl

    tl2tl New Member

    Messages:
    30
    Here, the PROS connect the gas line to a water heater control valve without a union between the tee and the thermostat. ( But in your case, why would you need a tee if you don't have traps?)

    The joint union is actually on the VERTICAL run of the black pipe, a foot or two above the "T".

    In fact, I have never even seen a union installed between the "T" and the thermostat.
  10. tl2tl

    tl2tl New Member

    Messages:
    30
    The union allows you an easy "starting point" for disassembling the gas connections.
    However, if you used the flex pipe for your connections, you won't need a union, since you can just unscrew the connecting nut.
  11. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,235
    Location:
    Cave Creek, Arizona
    union

    We ALWAYS installed the union between the tee and the gas valve, because the drop was installed long before the heater was on the job.
  12. tl2tl

    tl2tl New Member

    Messages:
    30
    THAT is correct! And that is exactly how the union is installed in the above picture, between the gas valve and the "T" on the vertical drop, you just can't see it.

    However, in your original reply you said it should've been between the "T" and the THERMOSTAT, which is not what you're saying above.

    It is possible to install it between the tee and the thermostat, I just don't think it's the best place for it and I've never seen it done that way.
Similar Threads: Flexi tube--does
Forum Title Date
Plumbing Forum, Professional & DIY Advice Flexible supply line for clawfoot tub Oct 2, 2014
Plumbing Forum, Professional & DIY Advice is flexible drain kit appropriate for my kitchen sink? Aug 12, 2014
Plumbing Forum, Professional & DIY Advice Can you use flexible rubber cuppling at bathroom sink drain? Photo May 28, 2014
Plumbing Forum, Professional & DIY Advice Old Flexible Lead Pipe, HOW to attach to? Mar 7, 2013
Plumbing Forum, Professional & DIY Advice Flexible ABS bath drain? WatcoFlex® Feb 15, 2012

Share This Page