1、Applicable Model: The RV toilet flush seal is replacement for Dometic 300 310 320 RV motorhome trailer toilets. Please confirm whether it is consistent with the product you need. 2、OE Number: The part number for reference is 385311658. Please confirm whether it is consistent with the OE you need to avoid wrong buying and other problems. 3、Perfect Sealing: The RV toilet flush ball seal promotes the benefits of security, ensuring a leak proof mechanism, preventing water from accidentally flowing for a better flushing action. 4、Premium Material: RV toilet flush seal gasket ring is made of premium rubber material, durable and reliable, high strength and wear resistant, providing you with a long lasting use. 5、Easy Installation: Installation takes only a few minutes. Simply pop out the old seal and place the new flush ball seal in, making sure it is fully seated.