Oil/Fuel Servicing Nozzle
An automatic shutoff oil/fuel servicing (open port) nozzle, figure 8, is provided to permit servicing of aircraft or vehicles not
equipped with a D-1 or CCR receiver. The nozzle is fitted with a non-valved two-inch unisex coupling
Figure 8. Oil/Fuel Servicing Nozzle
All fuel delivery components are connected with unisex dry-break couplings. The use of valved unisex couplings allows any
component to be isolated and removed from the system without defueling. The D-1 and CCR nozzles are subject to damage
from fuel expansion and are fitted with non-valved unisex couplings to preclude trapping a quantity of fuel that could expand
and damage a nozzle. Non-valved unisex couplings are used also on the fuel drum valved camlock elbow adapters because
the elbow valve provides the necessary isolation.
Unisex couplings consist of two basic components: the coupling and the inlet. Figure 9 illustrates the types of inlets provided
with the three-inch valved coupling. Figure 10 illustrates the types of 2-inch unisex coupling-inlet combinations. Figure 11
illustrates multiple unisex coupling-inlet combinations.