Union (O-Ring Type), Slip x Slip PVC Schedule 80 3/4" (897-007)

The 897-007 is a 3/4" PVC Schedule 80 O-Ring Union with slip (socket) ends on both bodies, designed to create a removable, pressure-rated disconnect point in solvent-welded PVC piping systems. Where a standard solvent-welded fitting produces a permanent joint, a union allows the piping system to be broken apart at that point for equipment removal, inline component service, filter replacement, pump maintenance, or system modification — without cutting pipe or disturbing adjacent fittings upstream or downstream of the disconnect location.

Manufactured from dark gray PVC Schedule 80 compound and compliant with ASTM D2467, this union carries NSF/ANSI 61 certification for potable water contact. The three-piece assembly consists of two solvent-weld socket bodies and a threaded collar nut that draws the two halves together against a precision O-ring seat. The O-ring seal — rather than a flat-face gasket — provides a consistent, reliable compression seal that re-engages correctly each time the union is reassembled, making it particularly well suited for systems that require periodic disconnection as part of routine maintenance cycles.

Each socket body is permanently solvent-cemented to its respective pipe end during installation, establishing fixed anchor points on both sides of the disconnect location. Once both bodies are set, the collar nut is hand-tightened and wrench-snugged to seat the O-ring under compression — no thread sealant or additional sealing compounds are required at the union joint itself. When disconnection is needed, the collar nut is backed off and the two bodies separate cleanly, leaving the pipe ends undisturbed and the system ready for reassembly once service is complete.

The heavier Schedule 80 wall thickness provides the pressure headroom and chemical resistance required in industrial process environments, chemical handling lines, and high-demand commercial systems where Schedule 40 unions are undersized or insufficiently resistant to the process media. At 3/4", the 897-007 is a common specification in chemical dosing lines, filter bypass assemblies, pump isolation points, and instrumentation removal joints where a reliable, repeatable disconnect is required at a small-diameter service point.

Solvent cement installation of each socket body follows standard Schedule 80 procedure — clean, prime, and cement both mating pipe surfaces using a Schedule 80-compatible PVC cement per ASTM D2564. Allow full joint cure before pressurizing the system or engaging the union collar.

Specifications

Industries & Applications

• Chemical Handling & Process Piping — Disconnect points on chemical dosing lines, reagent feed systems, and corrosive media transfer pipes where inline components such as pumps, meters, or injection quills must be removed periodically for service without cutting solvent-welded pipe
• Water Treatment & Purification — Filter housing isolation and cartridge replacement joints, chemical feed pump disconnects, and UV system removal points in municipal and industrial water treatment installations
• Industrial Process Piping — Pump suction and discharge isolation unions, strainer removal joints, and instrument bypass assemblies in process water, cooling water, and utility distribution systems where service access is a design requirement
• Commercial Plumbing — Serviceable disconnect points at water softeners, backflow preventers, pressure reducing valves, and inline equipment in commercial mechanical rooms where PVC is specified and periodic maintenance access is required
• Irrigation & Agriculture — Chemical injection pump isolation points, filter station disconnects, and valve actuator removal joints in Schedule 80-rated agricultural and turf irrigation systems
• Laboratory & Analytical Systems — Removable connection points for inline sensors, flow cells, and analytical instruments in controlled-environment PVC piping where reagent compatibility and leak-free reassembly are critical
• HVAC & Mechanical Systems — Serviceable PVC pipe disconnects at chemical feed equipment, cooling tower treatment injection points, and corrosion-resistant auxiliary lines requiring periodic component access