Eaton AE80660E - Aeroquip 1801 Dust Plug -4 (1/4")

The Eaton AE80660E is an Aeroquip 1800/1801 Series Rubber Dust Plug (Female), AN size -4 (1/4"), for Skydrol and phosphate ester hydraulic fluid environments. Designed to insert into the female (socket) coupling half of an Aeroquip 1800 or 1801 Series quick-disconnect, this plug seals the internal bore and valve area against contamination in Skydrol-service aircraft. The synthetic elastomer compound resists the phosphate ester chemistry that would rapidly degrade standard Nitrile rubber plugs.

Skydrol-Resistant Female Plug Design

• Synthetic elastomer compound resists Skydrol 500B-4, Skydrol LD-4, and equivalent phosphate ester fluids
• Protects internal valve seat and seal surfaces from phosphate ester fluid residue contamination
• Interference-fit installation fills the female coupling bore without fasteners
• Sized for the -4 (1/4") female coupling bore on 1800 and 1801 Series Skydrol halves

Constructed from synthetic elastomer compatible with the Skydrol service temperature range of -40°F to +250°F (-40°C to +121°C), the AE80660E provides Skydrol-rated protection where a standard Nitrile plug would be chemically incompatible. Paired with the appropriate Skydrol-rated dust cap for the male half, this plug completes the contamination protection protocol for coupling protection during maintenance, storage, and ground service intervals in phosphate ester hydraulic systems.

Skydrol System Maintenance Applications

• Female coupling protection during Skydrol hydraulic system servicing on commercial aircraft
• Storage protection for Skydrol-service female coupling halves in airline maintenance stock
• Paired with Skydrol-compatible male dust cap for complete coupling set protection
• MRO facility Skydrol hydraulic maintenance protocol compliance (servo actuator circuits, instrument hydraulic lines, and brake accumulator systems)