1" Union (O-Ring Type), FPT x FPT PVC Schedule 80 (898-010)

The 898-010 is a 1" PVC Schedule 80 O-ring type union in an FPT x FPT (Female Pipe Thread x Female Pipe Thread) configuration, providing a tool-free, fully removable connection point in a 1" threaded Schedule 80 PVC pipeline. Both ends accept standard 1" MPT fittings, nipples, or equipment connections, while the union body itself can be disconnected and reconnected at the slip nut without disturbing either threaded end — making this fitting the standard solution wherever a section of piping, a piece of equipment, or a valve assembly must be removed, serviced, or replaced without cutting into the line.

The all-FPT configuration makes the 898-010 the natural union choice for fully threaded Schedule 80 systems — pump connections, valve assemblies, instrument ports, and equipment interfaces where both sides of the disconnect point are MPT-terminated and the union bridges them with a single, serviceable joint. Unlike a slip x FPT union, which serves a mixed solvent-weld-to-threaded transition, the 898-010 is purpose-built for all-threaded pipelines where every connection in the system is threaded and the union provides the one point that can be broken and re-engaged without tools or sealant at the union joint itself.

The O-ring sealing mechanism is the defining feature of this union series. Rather than relying on a threaded or flat face-to-face joint, the union uses a captive elastomeric O-ring compressed between the two union halves when the slip nut is tightened. This produces a clean, consistent, leak-free seal that re-engages reliably across multiple service cycles, requires no sealant at the union joint itself, and can be inspected and replaced independently if wear, compression set, or chemical degradation occurs over time. For Schedule 80 systems handling aggressive chemicals, elevated pressures, or frequent maintenance cycles, the O-ring seal's reliability and replaceability are meaningful long-term advantages over flat-face alternatives.

Schedule 80's thicker wall construction provides higher pressure ratings and stronger resistance to mechanical stress and chemical exposure than Schedule 40, making the 898-010 appropriate for demanding industrial, chemical, and process environments where the heavier wall and gray Schedule 80 construction are specified. The gray color provides clear visual differentiation from white Schedule 40 union components in mixed systems.

Thread sealing at both FPT ends follows standard practice: apply PTFE thread tape or a compatible PVC-rated thread sealant to the male threads of all mating fittings before assembly. Avoid petroleum-based pipe dopes, which can degrade PVC over time. No sealant is needed at the union joint itself — the O-ring provides the seal when the slip nut is hand-tightened and snugged. Thread each mating fitting by hand first to confirm engagement, then snug with a strap wrench — do not over-tighten the FPT connections, as excessive torque risks cracking PVC female threads.

Specifications:

Industries & Applications:

The 898-010 all-threaded O-ring union is used wherever a 1" threaded Schedule 80 PVC pipeline requires a reliable, easily operated disconnect point for maintenance, equipment service, or system reconfiguration:

• Industrial Processing — Disconnect points in all-threaded 1" Schedule 80 process piping at pump ports, valve bodies, flow meters, and inline instruments where equipment must be removed or replaced independently without disturbing the surrounding threaded pipeline
• Chemical Handling — Serviceable union connections in acid, alkali, and reagent distribution systems at metering pump connections, injection equipment ports, and threaded instrument interfaces — where the O-ring seal provides chemical resistance and reliable re-engagement across repeated service cycles in aggressive process environments
• Water & Wastewater Treatment — Disconnect unions at chemical dosing pump connections, UV unit ports, filter vessel inlets, and threaded equipment interfaces in treatment plant piping where all-threaded Schedule 80 construction is specified and periodic equipment removal is required
• Irrigation & Agriculture — Serviceable disconnect points at pump station equipment, filter housing ports, pressure regulator assemblies, and threaded control equipment in pressurized 1" Schedule 80 irrigation systems where seasonal removal or equipment swaps are anticipated in fully threaded installations
• Commercial & Industrial Plumbing — Union disconnect points at water treatment equipment, backflow preventer assemblies, and mechanical room equipment in all-threaded Schedule 80 systems where periodic service access at equipment connections is required without cutting pipe or breaking joints throughout the line
• Aquaculture & Aquatics — Serviceable connections at UV sterilizer ports, pump equipment inlets, filter housing connections, and recirculating system instrumentation in all-threaded Schedule 80 installations where equipment removal without pipe disturbance is required
• Pool & Spa — Disconnect unions at pump and filter equipment connections in commercial pool mechanical rooms where 1" all-threaded Schedule 80 supply lines connect to equipment ports requiring periodic service access
• Laboratory & Research Facilities — Serviceable disconnect points in all-threaded Schedule 80 lab piping at instrument ports, reagent equipment connections, and inline sensor interfaces where the union allows independent equipment removal without disturbing the surrounding threaded pipeline