Usage Tips:[] replace the 385311658 RV toilet flush seal and 385311652 Dormite toilet seal, perfect for 300, 310, 320 RV toilets, perfect for RV and travel trailer toilets. Note: Not suitable for 210, 510, and other unmentioned models. [Easy installation]Replacement 385311652 RV toilet seal kit and 385311658 RV toilet flush seal is very simple. Just remove the old RV toilet seal and flush seal after shutting off the water source, clean RV toilet the edges and replace it with a one. Check for leaks and you are done. [High Quality RV Toilet Seal Kit]385311652 Dormite toilet seal and 385311658 RV toilet flush seal replacement are made of high quality composite material, fully tested by the manufacturer for high durability, strong seal and . solve the problem of unpleasant odor and water leakage, making your trip worry-free. [RV Toilet Seal Kit]This kit replaces one 385311652 RV toilet seal, one 385311658 toilet flush seal, set screws. 385311658 Toilet Flush Seal Size: 4 inch outside diameter; 2.75 inch inside diameter; 0.28 inch thickness. Color: Black Material: Silicone Package Contents: 1 set RV Toilet Seal ( text random, 't accept the specified.) 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.