Abstract: A hydrotherapy fitting assembly is provided, featuring: an axial nozzle socket and a nozzle therein, receiving an axial flow of water and air, and projecting them in admixture from the housing as a jet stream; the nozzle comprising two pieces threadably and fixedly linked together for pivoting and rotating movement together in the socket; a cylindrical housing piece defining a central chamber; a cylindrical plug valve piece having an axial water inlet at one end an axial water outlet at the other end, threadably mounted in the control chamber, and movable axially on the threads in the central chamber of the cylindrical housing between limiting positions extending across and closing off the side water inlets, and fully exposing and opening the side water inlets, with intermediate positions partially exposing and opening the side water inlets; and leaving the air inlet exposed and open in both limiting positions of the valve; and constraining water flow therethrough first in an axial direction, then in a direct

Abstract: A housing assembly for pressurized fluids is provided, having a cover removably attached to the housing in a manner that allows jacking of the cover into and away from sealing engagement with the housing, comprising, in combination, a housing; a fluid chamber in the housing; a fluid inlet and a fluid outlet in the housing in fluid flow connection with the fluid chamber; and a removable cover assembly closing off an open end of the fluid chamber and comprising a cover movable into and out from sealing engagement with the housing; a jack ring removably attached to the housing and having a central aperture; and optionally, when the vessel is pressurized, also having a peripheral portion to the housing engaging a peripheral portion of the removable cover; and means attaching the movable cover axially to the jack ring at the central aperture in a manner such that the jack ring engages the cover at a central portion adjacent the central aperture of the jack ring, and optionally also at a peripheral portion adjacent