How to replace the gasket under the toilet
Purchase a new RV toilet seal, making sure to get it for your RV model. Engineering plumbing on the site https://ya91.ru/catalog/inzhenernaya-santekhnika/.
Apply the RV on a flat surface.
Turn off the water pump and disconnect all lines from external water sources.
Turn off the water supply to the toilet. There is usually a valve in the back of the toilet that can be turned using a wrench.
Flush the toilet to remove as much water as possible from the bowl and dry it with a rag.
Wear rubber gloves to protect hands from bacteria and dirt. You can wear a mask for extra protection.
Disconnect the wastewater storage tank under the RV in accordance with the instructions in the RV User Guide. Although it is not necessary to remove the holding tank, it will make the job much more pleasant and eliminate the fear of returning the lost tool from the tank.
Find the bolts holding the toilet on the floor and remove them.There are usually only 2 bolts, but some of the larger RV toilets have 3 bolts.
Raise the toilet and set it aside.
Remove the old rubber seal. It can be made with either rubber or wax. It should rise easily, but if this does not happen, carefully handle it with a flat screwdriver to loosen it so that it can be removed and discarded.
Place a new RV toilet seal in the flange using a plumbing sealant to better reinforce it.
Put the bolts back into their holes and put the toilet on a new seal. Carefully tighten the bolts.
Connect external water lines and turn on the water pump.
Open the toilet water valve and flush to check for problems. If there were no problems, your work was flawless.