Contains 10 Pack H-553/5308696/ A912809-0070A / P6000-C31 O-Rings,H-553 O-rings have an outside diameter of approximately 1-3/8". H-553 O-Rings are processed with high quality rubber that is abrasion resistant, corrosion resistant, heat resistant, flexible, and can be used with slight deviations.It will not affect the use. For Sloan Royal and Regal as well as Zurn and American Standard flush valves. Installs in the groove at the end of the flusher and slides into the control baffle to form a watertight seal. It is recommended that the o-ring be replaced each time the connection is loosened to ensure a leak-tight seal. Warm reminder: Before purchasing, please check whether the size of the groove at the end of the flusher matches the outside diameter of the purchased O-ring, the difference is within 0.1 in can be used, please rest assured that the purchase, we are very willing to provide after-sales service. 10 Pack Replacement Sloan H-553 Stop Tail O-rings are inserted into the groove in the tailpiece of the flusher and the tailpiece with the o-ring slides into the control stop where the o-ring creates a watertight seal. It is recommended that the o-ring be replaced each time the connection is loosened to ensure a leak-tight seal. For Sloan Royal and Regal and Zurn and American Standard flush valves.