Mission Automotive Flush Ball Seal Gasket - Compatible with Dometic 300/310/320 RV Toilets - RV Flush Ball Seal Replacement - Leak-Proof Toilet Gasket Replacement - Pack of 1, Rubber, Round

You know the story: the rubber seal on your RV toilet leaks, and the water in the bowl disappears in 1 hour or 1 day. I've seen youtube videos that show how to fix such a leak, by replacing the seal. To me that seems ridiculous, because the seal is probably ok, but it's only caked in cr@p and needs to be cleaned off. I took that approach, properly cleaning the seal, and it held for years -- until it didn't. Eventually, it would not hold water, even after proper cleaning. Luckily, replacing the seal is super-easy, and requires no tools, no disassembly. Just turn off the water, open the trap, reach down and pull the seal off (extra careful not to drop it in the tank) and put the new one in. I found that the old rubber seal had limescale on it, and it was slightly deteriorated. Looking at it, I agree that it needed to be replaced, and simply cleaning it would not stop the leak. It was after 3 seasons of camping. This particular seal is an aftermarket seal, but it fit perfectly, and has now held water for more than 2 weeks. I recommend it. I also recommend first removing and cleaning the seal, before deciding it needs to be replaced.

Very easy to install and works very well

This worked for my Dometic. It fit perfectly and did the Job. FOR ALL THOSE PEOPLE SAYING IT DIDN'T!! Either they don't know the Model of their toilet ( Look at your toilet and do a google image search "Dometic toilet 310" or 320") AND / OR Your ball valve is knocked out of place and you need to pull it back into place. Turn off your water --> Open the ball valve --> Use a long tool with a hook on the end I.E. Crowbar etc.. (or your hand if your arm is small enough, mine is not) ---> Hook the hinge arm --> pull up Carefully BUT with some force. You MAY hear or feel a click when the Ball valve gets back into place. If this did not work you will have to take the toilet off and out side turn it over and you will see the connection point clearly. It is very light compared to a normal toilet. GOOD luck!!

Easy to install great product value for the price. Thanks JW

The toilet seal on the motorhome that I purchased used appeared to be leaking and disintegrating. After watching some YouTube videos on how to replace it, I debated purchasing this part or an OEM seal that cost twice as much. I ended up purchasing this one. The installation was easy although pretty gross. When I removed the old seal (don't drop it into the tank!), there was a lot of crud that had built up around it (yuck!) I cleaned the toilet as thoroughly as I could (wear gloves!), spread a little cooking oil on the bottom (do NOT use petroleum jelly as some have suggested) and it snapped into place fairly easily (don't drop it!) We have now been using it full-time for over a month with no issues. I would purchase this part again and save the cost of the OEM Dometic seal.

Works great for a 310. Plyable, correct dimensions. I’m pleased.

Fit the install slot accurately. Has worked correctly since installation last week. Water in and bad smells out. When replacing the old gasket. 1. Wear rubber gloves. 2. Clean mineral and other deposits from the slot where the gasket is inserted 3. Close the flush ball. 4. Lube the gasket with a water silicone grease. 5. Insert the gasket and gently push against the flush ball to make sure it conforms to the shape. 6. Test flush a few times. If the water stays in the toilet -- It is working.

This seal installed so easily. Snapped right into place with some silicone grease. My old one had crusted mineral deposits on it and was stuck. Had to get the pliers on it to grip it (old lady fingers) and I was worried about dropping it into the tank. Got it out, cleaned the seal area and this seal popped right in. It's holding water now! Great product at a great price! Will purchase again when needed!

Arrived way earlier than expected delivery. So happy about that. Very good product. Our trailer toilet doesnt leak anymore. Holds water now. Very good price. Less than half the price of the dometic brand. Rubber a bit softer than the original making it more flexible and fit better. seals really good. Very satisfied with product.

Bought in September and it has now failed… now buying a original Dometic seal as I’m sick of wasting good money on cheaper seals.

Good replacement for the original that would not completely seal. Easy to install but recommend a light coating of plumbing grease. Sealed completely after pressing the rubber against the ball/flap to conform to shape.

Needs a little grease to seal but works great.

Product was exactly what I needed replaced. Easy to install. Very happy with product!!