ARO Y330-113 Nitrile O-Ring for Diaphragm Pump Rod Seal Repair

Replacement O-Ring for ARO Diaphragm Rod Servicing

The ARO Y330-113 Nitrile O-Ring is a replacement seal for the diaphragm rod in compatible ARO air-operated double-diaphragm pumps. Its nominal dimensions are 3/32-inch cross-section and 3/4-inch outside diameter. Select this component when your pump’s parts list specifies Y330-113 for the seal being replaced.

Identify the Correct Seal Before Repair

In ARO’s 66610X-X-C 1-inch metallic diaphragm pump manual, Y330-113 appears as item 2, with one O-ring required in the documented assembly. This assembly quantity is separate from the quantity supplied in a seller’s package. The 3/4-inch dimension refers to the O-ring’s outside diameter, not the pump’s connection size.

For your maintenance order, record the complete pump model and the diagram reference alongside the part number. Treat the dimensions as a confirmation step rather than selecting a replacement solely by appearance.

Match the Replacement to Your Maintenance Needs

Consider an individual O-ring replacement when inspection identifies this seal as the component requiring attention. For a more extensive overhaul, review the other components needed before placing the order. ARO fluid-section repair kits include connecting-rod O-rings, additional seals, diaphragms and check components, with contents determined by the selected kit.

For the 1-inch PRO Series metallic pump family, ARO identifies 637119-XX-C as a fluid-section service-kit option. Compare the correctly configured kit with your repair requirements rather than assuming that one replacement O-ring covers the entire service job.

Installation and Ordering Guidance

Before servicing, disconnect the air supply and relieve system pressure. Follow the applicable ARO procedure, inspect the components and use Lubriplate FML-2 on the diaphragm rod and O-ring as specified.

When ordering, provide Y330-113, the full pump model and the quantity you need. For planned maintenance, add the part number to the equipment’s spare-parts record and review whether any associated components should be ordered at the same time.