Valterra RV Gravity & City Water Fill Hatch with Lock, Black — 1/2" MPT, UV-Stable Plastic

Valterra Black Gravity/City Water Hatch is a lockable RV fill hatch that lets you switch between gravity tank fills and threaded city-water hookups while keeping your inlet secure with two included keys.

This hatch assembly combines a gravity-fill opening and a city-water threaded inlet in one low-profile unit, built for RVs, travel trailers and campers. Molded from UV-stabilized plastic to resist sun damage, it includes a vented barb for faster fills, a 1/2" MPT thread for hose attachment, and a locking cover with two keys to deter tampering. The unit’s compact outside dimensions allow straightforward replacement or installation in most common RV sidewall openings.

How does the dual gravity and city water connection work?

The hatch accepts gravity fills directly into the holding tank through the non-threaded opening and also provides a 1/2" male pipe thread for standard city-water hoses. You choose the fill method by using the appropriate connection point—no adapters are necessary for typical setups.

• Gravity fill: non-threaded port for direct tank filling
• City water: 1/2" MPT threaded inlet for garden hose attachment
• 1-1/4" barb connection to improve flow when used with compatible fittings
• 1/2" air vent speeds venting and reduces backpressure during fills

Is the hatch durable and weather-resistant for outdoor use?

Yes — all exposed components are made from UV-stabilized plastic that resists fading, cracking and degradation from sun exposure. The design minimizes moving parts and uses a simple lock mechanism for long-term reliability in outdoor environments.

• UV-stabilized plastic construction for sun resistance
• Simple locking mechanism with two metal keys for secure closure
• Low-profile housing reduces snagging and wind exposure
• Plastic materials limit corrosion compared with metal assemblies

What size and fittings should I expect for installation?

The hatch is sized to fit most RV sidewall openings and provides common connection sizes for fast compatibility. Check the unit’s outside dimensions and hose thread to confirm fit with your camper’s existing plumbing.

• Overall outside dimensions: 7-5/8" wide × 6-1/2" high
• Threaded inlet: 1/2" male pipe thread (MPT) for city-water hoses
• Barb fitting: 1-1/4" barb for flexible hose attachment
• Includes 1/2" air vent to improve fill speed and venting

How does the locking mechanism enhance security and convenience?

The included lock and two keys let you secure the hatch against unwanted access when parked or stored. The small keyed cylinder is easy to operate and prevents accidental opens while still allowing simple authorized access for refills.

• Two keys provided so you can keep a spare handy
• Lock prevents tampering or accidental opening while traveling
• Simple key operation for quick access at filling stations
• Lock integrates into the hatch without interfering with hose connections

Who is this for? The Valterra Black Gravity/City Water Hatch with Lock Keys is suited for RV owners, trailer remodelers, and DIYers who need a compact, dual-use fill inlet that resists UV exposure and offers basic key-lock security. It works well for those replacing an old fill assembly or upgrading to a lockable inlet that supports both gravity filling and standard city-water hose connections.