Brass Pipe Bushing 1-1/2" x 1-1/4" NPT | Marine Plumbing Reducer Fitting
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Brass Pipe Bushing 1-1/2" x 1-1/4" NPT — Marine Plumbing Reducer Fitting
A mid-size brass reducer bushing for marine plumbing systems. This 1-1/2" male NPT x 1-1/4" female NPT bushing steps down a 1-1/2" threaded port to accept a 1-1/4" fitting, hose barb, or valve — a common transition size in bilge pump discharge lines, raw water plumbing, and exhaust system connections on mid-size to larger vessels.
Machined from solid brass, it resists corrosion in both freshwater and saltwater environments and forms a pressure-tight seal when used with marine-grade thread sealant. The NPT taper thread engages progressively as the fitting is tightened, eliminating the need for a separate gasket.
Key Features
- Size: 1-1/2" male NPT x 1-1/4" female NPT (reducer bushing)
- Material: Solid brass — corrosion-resistant in freshwater and saltwater
- NPT taper thread — pressure-tight seal without a separate gasket
- Suitable for bilge, raw water, exhaust, and general marine plumbing
- Use with marine-grade PTFE tape or pipe thread sealant for a leak-free connection
Best Use Case
Best suited for stepping down a 1-1/2" threaded port to a 1-1/4" connection in marine plumbing systems — commonly found in bilge pump discharge plumbing, raw water intake lines, and exhaust system fittings on mid-size to larger powerboats and sailboats. Always apply marine-grade PTFE tape or pipe thread sealant to NPT threads before assembly. Do not overtighten — NPT threads seal through taper engagement and excessive torque can crack brass fittings.
Parts Desk Insights
The 1-1/2" x 1-1/4" size is a common request for bilge pump discharge and raw water plumbing on mid-size vessels. When a customer needs this fitting, confirm whether they need a bushing (male-to-female, which this is) or a coupling (female-to-female) before ordering. Cross-sell with other sizes in the brass bushing range as needed: 1" x 3/4" Brass Bushing, 1-1/4" x 3/4" Brass Bushing, 2-1/2" x 2" Brass Bushing, and 3" x 2-1/2" Brass Bushing. For elbow fittings in the same plumbing run, see the Brass 90° Elbow 1-1/2" NPT.
Related Brass Plumbing Fittings
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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