HepvO

HepvO makes the waterless sink trap: a self-sealing waste valve that replaces a conventional P-trap. Instead of holding a water seal, an internal membrane opens when water drains and closes afterward to help keep sewer and gray tank odors out of the living space. With no water seal, there's nothing to evaporate, siphon or freeze in the trap. It suits RV and camper sinks, lavatories, showers, boats and tiny homes where under-sink space is tight. Everything ships from our warehouse in Upland, California.

HepvO valves we list

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A waterless trap for a 1-1/2 in RV sink or shower drain HepvO 1-1/2" Waterless Sink Trap with Angled Adapter (BV1B/UB) 1-1/2 in slip joint, white polypropylene, angled adapter included for horizontal or angled installs, no trap primer required. Alt. part numbers HepvO 5717 and WBV1BUB.

Confirm your drain size before ordering: the valve we stock is 1-1/2 in. Browse more RV water and plumbing parts and holding tanks.

HepvO guides: HepvO vs Generic Waterless Traps vs a Traditional P-Trap · How to Install a HepvO Waterless Trap in Your RV · Why Does My RV Sink Smell Like Sewer?

How is a HepvO different from a P-trap?

A P-trap relies on standing water to block sewer gas. A HepvO uses a self-sealing membrane instead, so it keeps working when the water seal would have evaporated, siphoned out on the road or frozen. See HepvO vs a traditional P-trap.

Can I replace my RV sink P-trap with a HepvO myself?

Yes. It connects with a 1-1/2 in slip joint, and the included angled adapter lets it sit horizontally or at an angle under the sink. Our install guide walks through the swap.

Why does my RV sink smell like sewer?

Usually the trap's water seal has dried out or siphoned away while driving, letting gray tank air back up the drain. Causes and the permanent fix.

How do shipping and returns work?

The HepvO valve ships free from Upland, California, in 3-7 days, with free 30-day returns using a prepaid label and no restocking fee.

Found HepvO cheaper somewhere else?

Send us the link before you order. Under our Lowest Price Guarantee we'll beat it.

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  • HepvO waterless sink trap self sealing RV drain valve HepvO Waterless Sink Trap product video by RV Parts Giant
    HepvO

    HepvO 1-1/2" Waterless Sink Trap with Angled Adapter | BV1B/UB

    30+ bought in past month
    $34.99
    $34.99
    $49.99
  • HepvO waterless sink trap self sealing RV drain valve
    HepvO

    HepvO Waterless Sink Trap for 1-1/4" Tailpiece with Angled Adapter | BV1B/UA

    $34.99
    $34.99
    $49.99