contact with shoulder 85 of plumbing fixture body 11 and the downward force generated by the tightening of brass bonnet 12 which moves spring housing 16 downwardly where its lower surface 86 abuts the upper surface 87 of valve seat housing 84 when brass bonnet 12 is removed the entire assembly may be lifted from plumbing fixture body 11 and valve seat housing 84 may simply be pulled away from spring housing 16 valve gasket 46 comprising o rings 47 and 48 pass completely through valve seat 49 and thus are exposed for inspection or replacement similarly if the valve seat 49 becomes somehow scored or damaged the entire valve seat housing 84 may readily be replaced it should be noted that valve seat housing 84 has a plurality of support ribs 88 which contact the exterior base of spring housing 16 helping to retain it in accurate central alignment with respect to valve seat 49 yet another important invention is the ability of the delayed closing valve to close without chatter or noise this is brought about by the provision of a pair of o rings of different size the larger o ring 47 has a larger cross sectional diameter than o ring 48 similarly o ring 47 is placed in a first step 89 of a groove which step has a smaller outside.