Perfect Fit For 300 / 310 / 320 Models
Our flush ball seals / flush ball gaskets are a perfect fit for Dometic 300,
310 and 320 RV, motorhome and trailer toilets. These flush ball seals replace
Dometic flush ball seal kits # 385311658.
High-Quality Material, Made To Last
Our valve seals are made from a high-quality, application-specific rubber blend
for optimal performance and a long-lasting lifespan.
DIY Install Saves Money
Don’t go out and buy a new toilet or pay an arm-and-a-leg to change the seal!
1.) Turn off water supply.
2.) Hold the flush ball open by depressing the flush pedal.
3.) Grasp the underside of the old seal and pull towards you to remove.
4.) Clean the rim and bowl area where the old gasket previously sat.
5.) Release flush pedal and allow the flush ball to close.
6.) Clean the flush ball.
7.) With the flush ball closed, put the new seal in and press outwards
to ensure that it is firmly in place.
8.) Reopen the flush ball and spread a lubricant in the areas where the gasket
will contact the flush ball.
9.) Open and close the flush ball several times, then press down on the gasket
to ensure it is properly positioned.
10.) Turn on the water supply, add water to the bowl and ensure that there are
Note: Potential lubricants include silicone grease, petroleum jelly and spray silicone.
This is a generic product manufactured and distributed by Mission Automotive.
This is not a Dometic OEM product and we has no affiliation with or endorsement
from Dometic. Our product is not covered under any Dometic manufacturer’s warranty.
The Dometic brand names and logos are the registered trademarks of their owners.
Any use of the Dometic brand name and model is made solely for purposes of describing
and illustrating compatibility.
Make sure this fitsby entering your model number.
Perfect For 300 / 310 / 320 Models — Our flush ball seals / flush ball gaskets are a perfect fit for Dometic (TM) 300, 310 and 320 RV, motorhome and trailer toilets. These flush ball seals replace Dometic (TM) flush ball seal kits # 385311658
High-Quality Material, Made To Last — Our valve seals are made from a high-quality, application-specific rubber blend for optimal performance and a long-lasting lifespan
DIY Install Saves Money! Don’t go out an buy a new toilet or pay someone an arm-and-a-leg to change the seal – follow our instructions below and you’ll be back up-and-running in no time
Does Not Fit 210, 510 Or Any Other Models Not Listed
Please note: This is an aftermarket replacement product (produced by Mission Automotive) meeting or exceeding the quality of OEM seals (based on in-house testing). We have no affiliation with or endorsement from any of the manufacturers mentioned