1. Flexible and easy to use.Perfect match with the RV 2. New and nice qulity, durable to use. 3. Built to strict quality control standards.Not easy to damage, long service life 4. Stable performance, high reliability.a perfect replacement for your old ones 5. Made of high quality material, for durable use. Item Type:RV Toilet Water Tank Sealing Ring Product Number Parts:23721 33361 Condition: 100% New Fitment:Direct Replacement Fitment:for Thetford C2 C3 C4 C200 C250 C400 Colour:Black Material:rubber Package Contents: 1 * RV Toilet Water Tank Sealing Ring 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.