Compatibility: Compatible with Hayward Pro S140T SP071620T S144T S180T S210T S220T2 S244T2 S270T2 S310T2 S360T2 S244T S166T S164T S220T S210S S244S S310S S311SX S311SXV S360SX series filters. Dimensions: Outer diameter 18cm, inner diameter 17cm, thickness 0.5cm. Attention: Please carefully compare your product size with our pictures. Material: The O-ring is made of rubber material and has steel and wear resistance. Packaging: 2 sand filter O-rings. Material Rubber Colour Black Outer diameter 18cm Inner diameter 17cm Thickness 0.5cm Compatible Brand For Hayward Compatible Model As description shown Type Sealing Gasket Brand Unbranded/Generic MPN TJ4894927372823 EAN 4894927372823 .