Union (O-Ring Type), Slip x Slip PVC Schedule 40 2" (457-020)

The 457-020 is a 2" PVC Schedule 40 union in a slip x slip (socket x socket) configuration, sealed with an O-ring between the two union halves. Both socket ends accept 2" plain-end pipe for solvent welding, while the union nut allows the two halves to be separated and reconnected at any time without cutting the pipe — making this fitting the standard solution wherever future access, equipment removal, or system servicing is a design requirement.

The O-ring seal is the defining performance feature of this union. Rather than relying on a machined face-to-face contact seal, the O-ring creates a positive, compressive seal between the two union halves that accommodates minor misalignment, maintains integrity through pressure cycling, and holds reliably across repeated assembly and disassembly cycles. This makes the O-ring union meaningfully more dependable in service than flat-face union designs — particularly in systems subject to vibration, thermal expansion, or regular maintenance activity.

At 2", the 457-020 is one of the most commonly specified union sizes in Schedule 40 PVC piping — found routinely at pump connections, inline filter housings, UV disinfection units, water treatment equipment, and any other point in a system where the ability to disconnect and reconnect without disturbing the surrounding pipe is a practical necessity rather than an afterthought.

Manufactured from virgin PVC compound to Schedule 40 dimensional standards, the 457-020 delivers solid pressure ratings for standard commercial and light industrial service. The union nut threads down over both halves to compress the O-ring and draw the joint together, and can be loosened by hand or with a strap wrench for disassembly without tools on the pipe itself. Like all Schedule 40 PVC fittings, the 457-020 is fully resistant to corrosion, chemical attack, and biological fouling — providing the disconnectable access point that metal unions offer, without the rust, galvanic corrosion, or seized-thread problems that accompany metal hardware in wet or chemical service.

Specifications:

Industries & Applications:

• Commercial Plumbing — Installing disconnectable access points at pump flanges, water softeners, filtration equipment, and service valves in commercial mechanical rooms where cutting pipe for removal is not practical
• Water Treatment & Municipal — Creating removable connection points at UV systems, inline meters, chemical dosing equipment, and control valves in treatment plant and distribution infrastructure
• Irrigation Systems — Allowing removal of filters, backflow preventers, master valves, and flow control equipment on 2" Schedule 40 mainlines for seasonal service or field repairs
• Industrial Process Piping — Providing removable, pressure-rated disconnect points on process lines for equipment isolation, inline component swaps, or system modifications without cutting pipe
• Chemical Processing — Installing serviceable break points in chemical feed, recirculation, or dosing lines where the O-ring seal maintains integrity through chemical exposure and repeated cycling
• Industrial HVAC & Cooling — Providing access points on chilled water, condenser water, or chemical treatment lines where equipment removal and reinstallation is a recurring maintenance requirement