Coupling, Slip PVC Schedule 80 2-1/2" x 1-1/4" (829-290)

The 2-1/2" x 1-1/4" PVC Schedule 80 Reducing Coupling Slip (829-290) provides a direct inline size reduction from a 2-1/2" pipe run to a 1-1/4" continuation in a single solvent-weld fitting—eliminating the need to stage a bushing inside a standard coupling or combine multiple fittings to achieve the same transition. Manufactured from rigid gray PVC conforming to ASTM D1784 Cell Class 12454, this reducing coupling is built for the pressure ratings and chemical resistance requirements of industrial, municipal, and commercial Schedule 80 piping systems.

Both ends accept standard Schedule 40/80 pipe via solvent cement, with the larger 2-1/2" socket on one end and the reduced 1-1/4" socket on the other. The slip-to-slip (socket-to-socket) configuration makes this fitting suitable for use with both Schedule 40 and Schedule 80 pipe, as both schedules share the same outside diameter for a given nominal size. Once solvent-welded, each joint creates a permanent, pressure-rated connection integral to the pipe wall.

The 2-1/2" to 1-1/4" reduction spans a significant size step, making this coupling particularly useful in manifold branch takeoffs, equipment connection headers, flow-splitting assemblies, and any piping configuration where a larger supply or main line transitions directly to a smaller distribution or service branch without an intermediate fitting run. Using a single reducing coupling rather than a bushing-in-coupling assembly minimizes the fitting count, reduces potential leak points, and delivers a cleaner, more compact installation.

Schedule 80 construction provides greater wall thickness and higher pressure ratings than Schedule 40, making this fitting appropriate for high-demand process piping, chemical feed systems, and industrial fluid handling applications where elevated service pressures or more aggressive chemical exposure are present. Gray PVC delivers broad resistance to acids, bases, salts, and a wide range of industrial process fluids. For service temperatures exceeding 140°F, refer to CPVC Schedule 80 equivalents.

Specifications:

Industries & Applications:

• Chemical Processing — Inline size transitions on chemical feed headers, dosing manifolds, and process fluid distribution lines where flow is stepped down from a larger supply to a smaller branch
• Water & Wastewater Treatment — Reducing couplings on pump discharge headers, chemical injection manifolds, and treatment system branch lines at pump stations and treatment facilities
• Industrial Manufacturing — Process piping assemblies requiring a compact, single-fitting inline reduction between supply and service line sizes in tight equipment spaces
• Irrigation & Agriculture — Mainline-to-branch transitions on pump station headers and filter manifolds where a 2-1/2" supply feeds a 1-1/4" zone or equipment connection
• Municipal Infrastructure — Distribution system and lift station piping where larger mains transition to smaller service or instrumentation branches
• Aquaculture & Aquatics — Recirculating system headers and return line manifolds where a larger pump discharge transitions to smaller distribution branches
• HVAC & Plumbing — Commercial mechanical systems with Schedule 80 PVC piping requiring an inline reducing coupling at equipment connections or branch points