ARO 96383 Polyurethane U-Cup Seal | 1/8 in. x 1.427 in. OD

ARO 96383 Polyurethane U-Cup Packing

The ARO 96383 is a replacement polyurethane U-cup packing seal used in the air-motor and major-valve section of compatible ARO air-operated double-diaphragm pumps.

Published ARO-compatible parts listings identify the 96383 as Item 139 and specify the size as 1/8 inch x 1.427 inch outside diameter.

Polyurethane Construction

The 96383 is manufactured from polyurethane. This material is used in pneumatic sealing applications where repeated valve movement and durable sealing performance are required.

The 96383 belongs to the pump air section and is not a wetted fluid-section component.

Verified Dimensions

• Component: U-Cup packing
• Material: Polyurethane
• Section: 1/8 inch
• Outside diameter: 1.427 inches
• Parts-list reference: Item 139

Major Air Valve Application

The 96383 is installed in the pneumatic major-valve assembly. Its sealing profile helps control internal air leakage as the valve spool shifts and redirects compressed air during pump cycling.

Wear or damage to this U-cup can contribute to reduced air-valve efficiency or irregular pneumatic operation.

Compatible ARO Pump Families

Published parts listings show the 96383 in multiple compatible Compact-Series ARO pumps, including selected:

• PD03P 3/8 inch non-metallic pumps
• PD05P 1/2 inch non-metallic pumps
• PD05A 1/2 inch metallic pumps
• PD07P 3/4 inch non-metallic pumps
• Related Compact-Series AODD configurations

Always verify the complete pump model and applicable air-motor parts list before ordering.

Included in 637141 Air Section Repair Kit

The 96383 is documented as a component of the ARO 637141 Air Section Repair Kit and corresponding major-valve service assembly.

If multiple pneumatic seals or valve components require replacement, compare the complete 637141 kit with purchasing the 96383 individually.

Related Major-Valve Components

In compatible air-motor assemblies, the 96383 is used alongside parts such as:

• 94395 polyurethane U-cup
• 93276 ceramic valve insert
• 96173 ceramic valve plate
• 95919 major valve spool
• Y325-29 Nitrile O-rings

These components perform different functions and should be matched to their exact OEM part numbers.

Maintenance Inspection

Inspect the 96383 during air-section service for:

• Cuts or tears
• Flattened sealing lips
• Deformation
• Surface wear
• Loss of sealing performance

Inspect the mating valve surfaces and bore before installing a new U-cup.

Ordering ARO 96383

Before purchasing, confirm:

• ARO part number 96383
• Complete pump model
• Polyurethane material requirement
• 1/8 inch x 1.427 inch OD dimensions
• Item 139 location
• Whether the 637141 Air Section Repair Kit is also required

Using the exact ARO part number helps ensure the correct major-valve U-cup is selected for the air-motor assembly.