2 will now be described all valves 8 and 11 are initially closed controls 140 open at least one valve 8 into header 3 and at least one valve 11 out of distributor 4 establishing an itinerary between at least one holding point and at least one processing point the itinerary extends through the associated branch or branches 6 and connection or connections 7 into the manifold or manifolds 14 inside header 3 on through forwarding trunk or trunks 5 into the manifold or manifolds 14 inside distributor 4 out through connection or connections 10 and in through branch or branches 9 once the processing agent or agents have been dispatched controls 140 close the open valves 8 and 11 and the overall facility will be ready for the next dispatching procedure any holding point 1a can of course be further subject to a dosimeter any processing point 2 can also have a rinse outlet 2a and the overall facility can be rinsed out between dispatching procedures in this event one or more of the branches 9 leading out of distributor 4 will be diverted to their associated rinse outlet 2a distributor 4 can accordingly be thoroughly rinsed with little or no rinse penetrating into one or more processing points 2 the corresponding outlet from distributor 4 can of course also be employed for other purposes rinse can be left in all or part of the facility when practical subsequent to a rinsing procedure header 3 and distributor 4 can also have special rinse intakes and outlets to allow rinse to be provided in accordance with specific requirements fig5 and 6.