[ for 300/310/320 Series]Specifically designed for 300/310/320 RV toilets. The precise fit ensures a reliable seal, effectively preventing water leaks and eliminating odors to maintain a clean and comfortable RV environment [High-Quality Rubber Material] Made from high-quality rubber with excellent elasticity and durability. this RV toilet gasket can withstand various weather conditions, resist aging and wear, and provide long-lasting sealing performance [Easy Installation] No disassembly or professional tools required! Simply turn off the water supply, remove the old seal, and the gasket into place. Save hundreds of on repairs and get back to enjoying your travels faster [2-Pack Value Bundle] Each set includes 2 premium seals, perfect for dual-toilet RVs or as a backup for long trips. A cost-effective solution that cuts replacement costs by 80% compared to buying a toilet or hiring a plumber [Full Kit & Support] 2 RV Toilet Seals(4 inch OD x 2.75 inch ID x 0.28 inch thick, 0.83oz each). Color: Black Material: Rubber Package Contents: 2Pack 385311658 RV Toilet Seal Gasket Replacement 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.