Abstract: A header fabricated of a lightweight non-metallic material includes a pair of opposed ears which are adapted for sliding mated engagement within a channel support. The header includes reinforced ribs which present relatively planar surfaces with spaced openings that accommodate a plurality of spray nozzles.

Abstract: A gun is provided for repeatedly dispensing precisely metered quantities of liquid from a pressurized source. The gun includes a valve spool axially slidable within a valve chamber and having at least first and second blocking members for blocking the inlet and outlet ports of the valve chamber. An actuating member associated with the gun is responsive to a unidirectional force to impart relative axial sliding movement of the blocking members in the valve chamber.

Abstract: An improved diaphragm-type antidrip valve including a valve body defining an annular valve chamber having a fluid inlet and an axial fluid outlet defined by a centrally located valve tube with a diaphragm element having its peripheral portion held in sealing engagement against the outer end of the valve chamber by an end cap and its front face disposed for sealing engagement with the open end of the valve tube, wherein the diaphragm is formed with a centrally located button projecting axially from its rear face and received and radially supported in a socket in a valve follower slidably mounted in the end cap and biased towards closed position by a compression spring and the end cap including an annular contoured ramp presenting a concave seat adjacent the effective outer periphery of the diaphragm for radially and axially supporting the diaphragm in its open position.