Home Repair Forum

  1. Log in to remove the ads. Not registered? Register here.

    Registration is FREE and we won't spam your email.

Results 1 to 6 of 6

Thread: Drum Trap Cover

  1. #1
    Join Date
    Nov 2004
    Location
    Pekin, Illnois, USA.
    Posts
    67
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Drum Trap Cover

    I have an old cast iron drum trap that my tub drains into. It has a pot metal cap on it that corrodes through every two years. Do they make a stainless or plastic cap I could use instead of this pot metal one? If so, where can I purchase one?
    Thanks, and Merry Christmas!!

  2. #2
    Join Date
    Apr 2004
    Location
    chicopee, Massachusetts
    Posts
    2,318
    Thanks
    0
    Thanked 29 Times in 28 Posts
    As I am sure you have learned from experience, snaking a line with a drum trap is impossible, and cleaning a drum trap is a chore reserved only for a first year apprentice training exercise. For those reasons drum traps are no longer used so you may have a booger of a time finding a cap. The best solution would be to cut it out and install a PVC trap that wont corrode.

    If you have metal pipes you could install the PVC trap and connect it to the metal pipes with a rubber FERNCO coupling.

    The whole project would cost less than $20 and take under an hour to complete.

  3. #3
    Join Date
    Jul 2004
    Location
    Saint Regis Falls, NY, USA.
    Posts
    8,287
    Thanks
    1
    Thanked 455 Times in 443 Posts
    I have seen metal plugs with extremely built up lead at an extreme taper on the threads which should adapt to different sizes of traps and cleanouts. The lead is soft enough to form a seal.

  4. #4
    Join Date
    Mar 2004
    Location
    .
    Posts
    801
    Thanks
    0
    Thanked 1 Time in 1 Post
    Bare in mind that replacing a drum trap with a P trap may also require you to install a vent for your tub in the case you don't have one. You can accomplish this by installing an air admittance valve if they're approved for use in your area.

  5. #5
    Join Date
    Apr 2004
    Location
    chicopee, Massachusetts
    Posts
    2,318
    Thanks
    0
    Thanked 29 Times in 28 Posts
    Removing the barrel trap and installing a P-trap should not necessitate any changes in venting. Venting is determined by the length of the waste arm and it is the same regardless of which type of trap was installed.

    To be a bit more specific..The maximum vertical distance from the drain opening to the trap may not exceed 24" except on a washing machine standpipe.

    There are tables in the code that list the maximum permissible horizontal length of the waste arm from the Trap weir(actual point of discharge in the trap) to the vent. The actual mathematical method of computing the length is by deviding the diameter of the waate arm line by the fraction of an inch pitch required. A tub requires an 1.5" trap, which is required to have a 1/4" per ft. pitch, thus the maximun lengt of the waste arm is 1.5/.25= 6ft. The code does allow the waste arm diamter to be increased one nominal trade size larger than the trap it serves therefore you could increase the waste arm to 2" which would yeild 2"/.25= 8ft.

    Regardless of what type of trap is installed, if the total developed length of the waste arm exceeds 8' you would be required to install an auxillary vent for the tub.

    The Uniform Plumbing code (UPC) has derated the mathematical maximums by about 50%. They list the maximum for an 1.5" line at 3ft 6in and a 2" line @ 5ft. (Check your local code authority to see which code applies in your jurisdiction)




  6. #6
    Join Date
    Nov 2004
    Location
    Pekin, Illnois, USA.
    Posts
    67
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Lazypup, do you have a diagram showing how to replace the drum trap? I think I am fed up enough to give it a try. I am not a plumber. so really don't know what I am doing.

    Thanks!

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •