Sloan Valve stop tail o-ring with a 1-3/8" diameter that fits into a groove on the flushometer tailpiece. The tailpiece with the o-ring then slides into the control stop, where the o-ring creates a watertight seal. It is recommended that you replace this o-ring each time you loosen the connection.
Sloan Valve Company, founded in 1906, manufactures restroom solutions. Sloan offers manual and sensor activated flushometers, vitreous fixtures, sensor faucets, surgical sinks and lavatories, retrofit products, tank toilet flush solutions, soap dispensers and hand dryers, water control and monitoring systems, soaps, sanitizers and deodorizers, bedpan washers, shower heads, and replacement parts. Its products are in place in correctional, educational, government, home, medical, recreation, religious, restaurant, retail, stadium, and travel markets worldwide.