ARO 95966 Nitrile U-Cup Seal | 3/16 in. x 1.792 in. OD

ARO 95966 Nitrile U-Cup Seal

The ARO 95966 is a genuine replacement Nitrile / Buna-N U-cup seal used in the air-motor section of compatible ARO air-operated double-diaphragm pumps.

Published ARO-compatible parts documentation identifies the 95966 as Item 138 and specifies the seal size as 3/16 inch x 1.792 inch outside diameter.

Nitrile / Buna-N Construction

The 95966 is manufactured from Nitrile, also commonly known as Buna-N or NBR. This elastomer is widely used in pneumatic sealing applications because of its suitability for compatible compressed-air systems, oils and lubricants.

Material suitability should still be verified against the actual operating environment, lubricant and temperature conditions.

Verified U-Cup Dimensions

• Seal type: U-Cup
• Nominal section: 3/16 inch
• Outside diameter: 1.792 inch
• Material: Nitrile / Buna-N

Item 138 in the Air Motor

The ARO 95966 is identified as Item 138 in applicable air-motor parts lists. It forms part of the pneumatic sealing system associated with the pump major air valve.

This is an air-section component and should not be confused with fluid-section seals that contact the pumped process liquid.

Compatible ARO Pump Applications

Published parts listings show the 95966 across several compatible ARO EXP and specialty diaphragm pump configurations, including selected:

• PD20 Series metallic pumps
• PD30 Series non-metallic pumps
• PH20 high-pressure pumps
• PP20 powder-transfer pumps
• Other compatible EXP air-motor assemblies

Compatibility depends on the complete pump model and air-motor design, so the full manufacturer model should always be verified before ordering.

Service Kit Component

Published parts references show the 95966 included in applicable:

• Air Section Service Kits
• Major Valve Service Assemblies
• Solenoid Service Kits

If several air-motor seals or valve components show wear, compare the appropriate complete service kit with replacing the 95966 individually.

Air Motor Sealing Function

The U-cup helps provide directional sealing within the pneumatic valve system. A worn, hardened, cut or damaged U-cup can contribute to internal air leakage and reduced air-valve efficiency.

Maintenance Inspection

During air-section service, inspect the 95966 along with neighboring components such as:

• Y325-32 Nitrile O-ring
• Y186-50 Nitrile U-cup
• Valve insert
• Valve plate
• Track gaskets
• Pilot-valve seals

Ordering ARO 95966

Before purchasing, confirm:

• ARO part number 95966
• Complete pump model
• Item 138 position
• Nitrile / Buna-N material requirement
• 3/16 inch x 1.792 inch OD dimensions
• Whether a complete air-section kit is required

Using the exact manufacturer part number helps ensure the correct U-cup size and material are selected for the ARO air-motor assembly.