Forum Discussion

riverboaterbill's avatar
riverboaterbill
Explorer
Nov 15, 2016

Odor From Sink in Bathroom

Hi,
A problem has arisen regarding a bad odor apparently coming from the bathroom sink. The black and grey tanks have been thoroughly flushed and drained during winterization and the P-trap is full of antifreeze. There is still a bad odor seemingly coming from the sink. I would appreciate any suggestions on what to investigate. Thanks in advance!


I may be a little old, but I sure am broke!
  • Old-Biscuit's avatar
    Old-Biscuit
    Explorer III
    Nov 15, 2016
    Inside sink cabinet on sink drain line after the 'P' trap is an 'air admittance valve'. Hand tightened into a stub pipe...allows air into drain line when dumping waste tank so 'P' traps don;t get sucked dry'

    When they don't close.....stink from waste tank gets inside rv

    They use cheap rubber flapper held closed by a tang.it stretches and flapper dosen't get pulled closed

    Any hardware store for replacement
  • RollandB's avatar
    RollandB
    Explorer
    Nov 15, 2016
    I had the same issue with our kitchen sink, changed the air admittance valve, no more odor
  • goducks10's avatar
    goducks10
    Explorer
    Nov 15, 2016
    Old Duck wrote:
    I had the same issue with our kitchen sink, changed the air admittance valve, no more odor


    x2
  • riverboaterbill's avatar
    riverboaterbill
    Explorer
    Nov 15, 2016
    Thanks Guys! I appreciate the advice. I will investigate pronto! It is really a great thing to be able to get help from fellow campers! I will try to pass it forward!
    Bill
  • Carl_n_Susan's avatar
    Carl_n_Susan
    Nomad II
    Nov 15, 2016
    Another common cause of this is having an RV which is plumbed for a washer but none is installed. Flush out the lines to the washer and your smell will disappear.

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