To provide a dispensing head assembly including an improved bung adapter, a body receiver and a distribution body.

The bung-adapter 200 inserts into a drum. The body receiver 300 is selectively inserted into the bung adaptor 200, and the distribution body 500 is selectively inserted into the body receiver 300. A single, unobstructed, uniform-diameter flow path guides fluid from the drum into a chamber 560 in the body receiver 300. A movable piston 700 in the chamber selectively blocks a fluid flow between the fluid flow path and a distribution opening on the distribution body 500. The body receiver 300 and the distribution body 500 are key-matched for safe and rapid coupling and decoupling.