Amway AM-OR-E9225 Quixtar E-9225 Compatible O-Ring The Amway compatible o-ring is 5-3/8 in outer diameter&#44; 5 inner diameter&#44; and 3/16 The Amway Quixtar compatible oring is for the Amway E-9225 water filtration systems. The Amway o-ring is 5-3/8 in outer diameter&#44; 5 inner diameter&#44; and 3/16 thickness. Design is stylish and innovative. Satisfaction Ensured. Great Gift Idea.