Dometic 385312090 Water Valve Module 12V | 7600 Toilet

If your Dometic MasterFlush 7600 toilet has started running when it shouldn't, or the bowl won't fill on the flush cycle, the water valve is usually the first thing to check. The Dometic 385312090 is the genuine replacement water valve module for the 7600 series, and swapping it in brings the flush back to the way it worked the day the boat left the dock.

Here's what this part actually does. On a MasterFlush electric toilet, the water valve is the solenoid that opens to let rinse water into the bowl each time you press flush, then closes when the cycle ends. When that valve wears out or sticks, you get one of two symptoms. Either water keeps trickling into the bowl and the pump cycles over and over, or the bowl stays dry and the flush never rinses clean. Both point back to the same part, and both are fixable in an afternoon without pulling the whole toilet.

This is the complete water valve assembly kit, not a single seal or O-ring. Dometic ships it as a module so you replace the valve as a unit and skip the guesswork of rebuilding the old one. It runs on 12 volt DC, matching the standard electrical supply on the 7600 series, and it's a direct-fit part built to the original Dometic spec. That matters on a repair like this. A generic valve that almost fits will leak or cycle wrong, and the last thing you want in a marine head is a valve that won't seal.

The 385312090 fits the Dometic MasterFlush 7600 series, including the popular 7640. These are the electric macerating toilets you'll find on cruising sailboats, express cruisers, and plenty of RVs, so this valve works for both marine and RV installs. If you've got a 7600-series toilet with a water supply problem, this is the OEM part number Dometic points you to.

Not sure the valve is the culprit? Here's the quick diagnosis we walk boaters through. Watch the bowl after a flush cycle finishes. If water keeps seeping in after the pump stops, the valve isn't sealing shut, and it's done. If you press flush and no rinse water arrives at all while the pump still runs, the valve isn't opening. Either way the fix is the same module. Rule out a tripped breaker or a closed valve on the water supply first, since those mimic a bad valve and cost nothing to check.

Replacing it is straightforward for anyone comfortable with basic hand tools. Kill the 12V power to the toilet at the breaker, shut off the water supply, and you can get at the valve without dropping the toilet off its base. Take your time on the connections and make sure everything's dry and seated before you power back up. If you've ever swapped a bilge pump or wired in a new light, you've got the skills for this.

One honest note, because we'd rather you order the right thing once. This listing is the water valve module only. It's not a complete toilet and it's not the macerator pump or the motor. If your flush problem is the pump grinding or the motor not spinning, that's a different part. But if the issue is water flow into the bowl, the valve won't shut off, or the toilet keeps running, this is very likely your fix.

It's backed by a limited two-year warranty, and because it's a genuine Dometic component, it carries the full factory fit and finish. We keep marine sanitation parts like this in stock because a toilet that won't flush right ranks near the top of the list of things that end a good weekend early. Order it, keep the old one as a spare core if you like, and get your head back in service.