[PACKAGE INCLUDES]-- 3 x 385311658 flush ball seal gasket, 4 Inch Outer Diameter, 2.75 Inch Inner Diameter, 0.2 Inch thickness/height. 385311658 Water flush ball sealing gasket can effectively solve the problem of odor and leakage caused by the gasket rupture, keep the water in the toilet, do not emit odor, suitable for RV and trailer toilet, to provide you with a clean and comfortable travel environment, improve the quality of life. [HIGH QUALITY MATERIAL]-- The 385311658 flush ball seal gasket is made of advanced structure and high quality rubber, which has been fully tested by the manufacturer. It has high efficiency, more durability and ensures its service life. Its compact and easy-to-operate overall structure is for safety and leakage prevention, giving you a more comfortable and clean use experience. [COMPATIBLE ]-- 385311658 Flush ball seal fit 300/301/310 series RV toilet, not 210 510 or any other model not listed! If unsure of compatibility, please consult us and provide your model before ordering. [EASY TO UINSTALL]-- The 385311658 flush ball seal gasket can be replaced by itself, very simple. Instead of removing the toilet, just take out the old sealing ring and replace it with a one. If you do not know how to install, you can find the installation video through the online video to learn more. Before installation, turn off the water supply and power supply, and wear work gloves to protect your hands. Colour:Red Material:Rubber Package Contents: 3x RV Toilet Seal Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.