Twin tube locking assembly

Apparatus for retaining an extended suction set to portable paint spray equipment comprising:

• a) hand-held paint spray gun carrying a piston pump housing having
• i) a paint inlet for providing a path for paint to be delivered to a piston pump in the housing,
• ii) a return port for providing a path for paint leaking past a piston in the gun, and
• iii) first retaining means adapted to engage a paint cup to the pump housing;
• b) an extended suction set for use in the absence of the paint cup, the suction set having
• i) an elongated double lumen hose for drawing paint from a remote container for delivery to the gun in one lumen and providing a closed path for paint from the return port to be carried back to the remote container, and
• ii) a double lumen fitting having a flange extending from a pair of relatively rigid nipples adapted to mate the hose to the paint inlet and return port;
• and
• c) a twin tube retaining ring for securing the double lumen fitting to the paint spraying gun, the ring having
• i) a body,
• ii) an aperture in the body smaller than the flange and shaped to permit limited rotation of the retaining ring with respect to the gun and fitting when the fitting is connected to the inlet and return port of the gun, and
• iii) second retaining means on the ring adapted to engage the first retaining means on the pump housing
• such that the fitting is releasably secured to the inlet and return port when the first and second retaining means are engaged and the fitting is free to be released from the inlet and return port when the first and second retaining means are disengaged.