Mansfield Flush Valve Stop Cap 225-5907 Colors vary. This is the part that screws on top of the flush valve and keeps the flush tower from rising too high. Fits 208, 209, 210 211 Flush Valves. When it is broken the flush valve can get hung on it preventing the tower from falling back down to close the valve. Many times when this part is broken it happens because the toilet is hard to flush and replacing the flush valve seal will make it easier to flush. Track Page Views With Auctiva's FREE Counter If you are not satisfied for any reason products may be returned within 14 days of shipment for a credit or exchange (provided the product is undamaged), except where noted, NOT RETURNABLE. Return documentation should clearly specify credit or exchange. Returned items must be in the original packaging. All returns must include a return authorization (RGA) number that can be obtained by contacting our Customer Service Department. Original shipping cost deducted. Reference to brand names and numbers are for reference only, and not meant to imply that they are made by that manufacturer (OEM). Sometimes images shown are generic and not meant to infer that they are actual. The parts will work as intended and are high quality and precision tested.