Union (O-Ring Type), FPT x FPT PVC Schedule 80 1-1/4" (898-012)

The 1-1/4" PVC Schedule 80 FPT x FPT O-Ring Union (898-012) delivers a reliable, leak-free disconnectable joint in threaded PVC piping systems where maintenance access, equipment serviceability, or periodic disassembly is required. Manufactured from rigid gray PVC conforming to ASTM D1784 Cell Class 12454, this three-piece union is engineered for the chemical resistance and pressure demands of industrial, municipal, and commercial applications.

The three-piece union design consists of two threaded end bodies and a union nut, allowing the joint to be fully separated and reconnected without cutting, threading, or modifying any pipe in the system. Each end body accepts a male-threaded pipe or fitting via its FPT (female pipe thread) connection, making this union a natural fit for threaded Schedule 80 assemblies where solvent-weld access is impractical or where the system was built entirely with threaded components.

What distinguishes the 898-series from standard flat-face PVC unions is the O-ring sealing system. Rather than relying on a flat PVC-to-PVC face contact for the union joint seal, the O-ring union incorporates a recessed elastomeric O-ring that compresses against a machined seat when the union nut is tightened. This provides a more consistent, vibration-resistant, and temperature-cycle-tolerant seal compared to flat-face designs—particularly valuable in systems with minor thermal expansion, pump-induced vibration, or frequent disassembly cycles that can degrade flat-face sealing surfaces over time.

At 1-1/4", this union is well-suited for branch lines, chemical feed systems, pump isolation assemblies, valve bypass loops, and instrumentation connections where threaded fittings are standard and a disconnectable union joint is required for servicing. Gray PVC resists corrosion from acids, bases, salts, and a broad range of process fluids, providing a cost-effective and long-service alternative to metal unions in chemically aggressive environments. For service above 140°F, refer to CPVC Schedule 80 equivalents.

Specifications:

Industries & Applications:

• Chemical Processing — Disconnectable unions on chemical feed pumps, metering systems, and dosing lines where routine maintenance and pump pulls are required
• Water & Wastewater Treatment — Pump isolation unions on chemical injection skids, chlorination systems, and UV treatment equipment in threaded piping configurations
• Industrial Manufacturing — Threaded process piping assemblies requiring accessible union joints for filter changes, valve servicing, or equipment replacement
• Irrigation & Agriculture — Threaded pump connections and chemical injection points on fertigation and irrigation systems requiring periodic service access
• Municipal Infrastructure — Lift station and treatment plant piping where O-ring unions provide reliable re-sealable joints on frequently serviced equipment
• Aquaculture & Aquatics — Recirculating system pump and filter connections in threaded PVC assemblies where regular disassembly for cleaning is required
• HVAC & Plumbing — Commercial mechanical systems with threaded PVC piping requiring service unions at equipment connections and isolation points