1-1/2 inch PVC Schedule 40 Union with O-Ring Plastic x Plastic

1-1/2” PVC Schedule 40 Union with O-Ring – Socket Connection for Demountable Joints

The 1-1/2" PVC Schedule 40 union is a two-piece demountable fitting designed to allow easy separation of piping sections without cutting. This union includes a precision-machined elastomeric O-ring seal, providing a watertight connection suitable for pressurized or non-pressurized applications in residential, commercial, and light industrial systems.

Constructed from rigid polyvinyl chloride (PVC) Type I, Cell Class 12454 (per ASTM D1784), the union conforms to Schedule 40 dimensional standards and is suitable for solvent-weld socket connections. It is typically used in cold water distribution, irrigation systems, and low-pressure process piping where component removal or maintenance access is required.

Technical Specifications

• Nominal Size: 1-1/2 inch
• Material: PVC Type I, Grade I (ASTM D1784, Cell Class 12454)
• Connection Type: Socket x Socket with O-ring seal and union nut
• Seal Type: Buna-N (Nitrile) or EPDM O-ring (varies by manufacturer)
• Standards Compliance: ASTM D2466 (fittings), NSF 14 certified for potable water and DWV
• Pressure Rating: 150 PSI @ 73°F (non-shock)

Key Features

• ✅ Field-Serviceable Design – Union body allows pipe separation without requiring cutting tools or rework
• ✅ O-Ring Seal Integrity – Provides consistent sealing under low-pressure conditions; suitable for maintenance-intensive systems
• ✅ Schedule 40 Compatibility – Matches wall thickness and outside diameter of standard PVC Schedule 40 pipe
• ✅ Non-Corrosive Construction – Resists internal scaling, chemical degradation, and external moisture exposure

Installation Guidelines

Solvent-weld all socket ends using ASTM F656 primer and F493 solvent cement. Clean and deburr all pipe ends prior to assembly. Ensure that the O-ring is properly seated and the union nut is hand-tightened before pressurizing. Do not overtighten, and verify that the union is installed in an accessible location to allow future disassembly.

Common Applications

This union is widely used in potable water lines, irrigation manifolds, pump assemblies, and serviceable piping zones requiring periodic access. It is also commonly installed in filter systems, heater bypass loops, and drain assemblies in both above-ground and vertical orientations.

Material and Code Notes

All components meet current lead-free standards under NSF/ANSI 372 and are approved for potable water systems in all jurisdictions. PVC unions are not intended for compressed air or gas service and should not be exposed to continuous elevated temperatures above 140°F.

The 1-1/2” PVC Schedule 40 union with O-ring offers a code-compliant, demountable solution for piping systems requiring field-accessible joints, servicing flexibility, and consistent seal performance under variable pressure conditions.