The Cla-Val Model 340AF Pressurized Fuel Servicing Adapter is a connection adapter for the delivery of pressurized fuel to refueling tank trucks and fueling support vehicles at commercial airports. Constructed of high-strength stainless steel and aluminum for long service life, Cla-Val adapters provide accurate connections for safe and efficient transfer during refueling. Series 340 AF-2 / 340 AF-4 /340 AF-6 /340 AF-8. https://www.cla-val.com/aviation-fueling-commercial-adapters