Bushing, Spigot x FPT (Flush Style) PVC Schedule 80 3" x 1-1/2" (838-337)

The 3" x 1-1/2" PVC Schedule 80 Flush Bushing (Spigot x FPT) provides a compact, pressure-rated transition from a 3" Schedule 80 socket fitting down to a 1-1/2" female NPT threaded port. The spigot end inserts directly into the socket of an existing 3" Schedule 80 fitting, while the 1-1/2" FPT socket accepts any standard 1-1/2" male NPT fitting, valve, equipment connection, or threaded adapter — creating a threaded interface within a solvent-welded system in a single flush-profile fitting body.

With the 838-33x sub-series now complete, the 838-337 can be understood in its full context within the group. It sits at the inflection point in the series where the outlet transitions from branch-and-tap territory into genuine flow-carrying territory. The smaller outlets — 838-334 (3/4"), 838-335 (1"), and 838-336 (1-1/4") — are most commonly used for instrument ports, gauge taps, chemical dosing connections, and small-diameter branch lines where flow volume at the threaded port is modest. The larger outlets — 838-338 (2") and 838-339 (2-1/2") — are high-flow connections approaching the main line's full capacity. The 1-1/2" outlet of the 838-337 bridges these two application zones: large enough to serve as a genuine secondary service line, equipment feed, bypass run, or drain connection, yet representing a meaningful reduction from the 3" main run that preserves the primary line's flow capacity.

Critically, 1-1/2" is the most common branch and secondary line size in commercial plumbing and irrigation systems — more broadly standardized than 1-1/4" and nearly as common as 2" across valves, equipment ports, filter inlets, and threaded fittings in commercial and industrial piping catalogs. This makes the 838-337 the most broadly compatible outlet size in the sub-series in terms of the range of 1-1/2" NPT-threaded components it can directly accept — ball valves, gate valves, check valves, strainers, pressure gauges, chemical injectors, unions, adapters, and inline instruments are all widely available in 1-1/2" NPT configurations. The result is a fitting with broader new-construction applicability than any other SKU in the 838-33x group, relevant across a wider range of system types, equipment connections, and design contexts than the more specialized outlet sizes on either side of it.

Manufactured to ASTM D2464 standards and listed under NSF/ANSI 14, the 838-337 is molded from dark gray Schedule 80 PVC compound, delivering the greater wall thickness, elevated pressure ratings, and broad chemical resistance that Schedule 80 specifications demand across industrial, chemical, and commercial service environments.

Specifications:

Industries & Applications:

• Pump Systems & Mechanical Rooms — Used at 3" Schedule 80 fitting bodies on pump suction and discharge assemblies where a 1-1/2" threaded valve, strainer, auxiliary equipment port, or bypass connection must interface with a solvent-welded 3" Schedule 80 system; the 1-1/2" FPT outlet provides access to the broadest selection of compatible NPT-threaded valves and instruments in the sub-series, making it the most versatile choice for pump assembly design and future equipment changes
• Chemical Processing — Installed in 3" Schedule 80 solvent-welded chemical distribution and transfer headers to provide a 1-1/2" threaded port for secondary process lines, chemical sub-feeds, moderate-to-high-capacity dosing connections, and equipment interfaces in systems handling acids, bases, and aggressive industrial fluids where both flow capacity and component compatibility at the threaded outlet are design priorities
• Industrial Manufacturing — Applied in process piping systems where a 3" Schedule 80 solvent-welded main must provide a 1-1/2" threaded branch connection for a secondary process line, bypass assembly, equipment feed, or drain connection with meaningful flow capacity; the flush profile keeps the assembly compact in panel piping and tight mechanical configurations where hex bushing clearance would be problematic
• Municipal Water & Wastewater — Installed at 3" Schedule 80 fitting bodies in pump stations, treatment facilities, and distribution infrastructure where a 1-1/2" threaded branch is required for a service valve, chemical dosing line, secondary distribution connection, or equipment interface within a permanent solvent-welded Schedule 80 system
• Commercial Plumbing — Used in mechanical room Schedule 80 piping where a 3" solvent-welded service line must provide a 1-1/2" threaded connection for a branch service line, drain valve assembly, equipment feed, or bypass run; the 1-1/2" FPT outlet's broad compatibility with standard commercial plumbing valves and fittings makes this the most practical outlet size in the sub-series for general commercial mechanical applications
• Irrigation & Agricultural — Applied at pump discharge assemblies, filter station inlets, and valve manifold connections where a 3" Schedule 80 solvent-welded supply fitting must transition to a 1-1/2" threaded valve, filter vessel port, chemical injector, or lateral distribution line in large-scale commercial and agricultural irrigation infrastructure
• Water Treatment & Filtration — Provides a high-compatibility 1-1/2" threaded equipment interface at 3" Schedule 80 fitting connections in multi-stage water treatment systems, filter manifolds, UV system inlets, and chemical injection assemblies where the broad availability of 1-1/2" NPT-threaded treatment and monitoring components maximizes design flexibility within the solvent-welded 3" Schedule 80 piping network