Abstract: This application concerns a distributor for agricultural chemicals, and in particular a manifold used in distributors of anhydrous ammonia. The manifold comprises a housing having an axially aligned inlet port and several radially arranged outlet ports. The outlet ports have equal angular separation around the periphery of the housing. A rotatable distributor is arranged within the housing, and a passage is provided through the rotatable distributor. The passage extends from an entry port communicating with the inlet port of the housing, to a delivery port which communicates with each outlet port in turn as the rotor rotates about the axis. The arrangement is such that, in use, the rotatable distributor has sufficient rotational momentum to enable it to behave like a flywheel, so that its rotational velocity remains substantially constant irrespective of the volumetric proportions of liquid to vapor at the entry port.