Abstract: A check valve has a valve body and flapper. The flapper has a gasket which is sandwiched between a flapper base and a flapper cover. The flapper base has a flapper base stem which extends through an aperture in the gasket is retained within an aperture in the flapper cover. A central recess is defined in either the forward surface of the flapper base or the forward surface of the flapper cover to allow liquid which leaks between the flapper base and the gasket to migrate to the flapper base stem, and subsequently along the flapper base stem to the external side of the flapper cover. In this way, the flapper is capable of relieving pressure build-up between the gasket and the surface of the flapper base.

Abstract: An adjustable rotating hydrotherapy jet that rotates around primary and secondary rotation axes and includes a housing, a water inlet to the housing, and a water nozzle within the housing that forms water flowing through the inlet into a drive jet. A primary outlet is rotatably mounted on the housing about a primary rotation axis and holds the outlet downstream from the water nozzle to receive the jet flow and discharge the flow along an outlet axis. The jet flow through the primary outlet imparts a turning moment to the outlet, causing it to rotate relative to the primary rotation axis and discharge a first stage jet. A secondary outlet is rotatably mounted on the primary outlet about a secondary rotation axis to receive the jet flow from the primary outlet. The jet flow imparts a turning moment to the secondary outlet that causes it to rotate relative to the secondary rotation axis and discharge a second stage jet.