4381036420 – Reducing Coupling, 1-1/2 in x 1/4 in FNPT, 316 Stainless Steel, Class 150
4381036420 – Reducing Coupling, 1-1/2 in x 1/4 in FNPT, 316 Stainless Steel, Class 150
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Commercial Ordering FAQ
How do I verify that 4381036420 – Reducing Coupling, 1-1/2 in x 1/4 in FNPT, 316 Stainless Steel, Class 150 is the correct replacement part for my equipment?
Check the OEM part number (4381036420) against your equipment nameplate or the manufacturer's repair parts list before ordering. If you are not sure, call the National Boiler Supply order desk at 850-565-3492 and we can cross-reference your equipment model and serial numbers before the order ships.
What are the shipping and freight options for Generic orders?
Standard parcel orders ship quickly from commercial distribution centers. Shipping is a $35 flat rate on orders under $999, and qualifying orders of $999 or more ship free by ground. Heavy equipment that has to move by LTL freight is quoted after the order is placed and confirmed with you before dispatch.
Can contractors or facility managers request a formal quote or use a Purchase Order (PO)?
Yes. National Boiler Supply works with commercial contractors, mechanical engineers, municipalities, and facility teams. Call 850-565-3492 for a formal quote, bulk pricing, or PO and tax-exempt order processing.
What if this Generic part is marked Call to Order or needed for an emergency repair?
Call our order desk at 850-565-3492. We can confirm factory lead times right away and arrange expedited air or hot-shot delivery when a repair cannot wait.
Order the 4381036420 Reducing Coupling from National Boiler Supply. Call our order desk at 850-565-3492 for a formal quote or a part number cross-check.
Product Overview
Made from 316 stainless steel, it notes that corrosion resistance depends on operating environment. This coupling is rated within the specified pressure parameters and can withstand steam pressures up to 150 psi. It features FNPT connection types on both ends, with the Side A female thread of 1 1/2 inches nominal size and an outside diameter of 3/4 inches, and the Side B female thread of 1/4 inch nominal size. It is suitable for use in sanitary, chemical, and industrial piping systems requiring reliable, pressure-rated, corrosion-resistant joins.
Features
- Material Grade: 316 Stainless Steel for corrosion resistance and durability.
- Pressure Ratings: rated for use within the specified pressure parameters.
- Connection Types: FNPT on both ends for threaded pipe connections.
- Sizes: Side A features a 1 1/2 inch nominal pipe size with 3/4 inch outside diameter; Side B features a 1/4 inch nominal pipe size.
- Pressure Class: Rated as Class 150, conforming to industry standards listed.
- Standards: Meets ASTM-A-351, ANSI/ASME B1.20.1, and MSS-SP-114 Class 150 specifications.
Technical Specifications
| Manufacturer Part Number | 4381036420 |
|---|
OEM Part Verification: Confirm part number 4381036420 against your equipment nameplate or parts list before ordering. Our order desk can cross-check it for you.
Order Desk Support: Call 850-565-3492 for formal quotes, lead times, and volume pricing.
Corporate Procurement & PO Processing
Formal Purchase Orders (POs) and tax-exempt ordering are accepted for commercial contractors and institutional facilities.
Apply for Trade Account & Terms →📋 Procurement & Shipping Notice
- LTL Freight Dispatch: Heavy commercial units ship directly via insured LTL carrier with delivery coordination included.
- Project Timelines & Submittals: Need guaranteed delivery dates, formal submittals, or tax-exempt processing?
👉 Request a Commercial Quote or contact our procurement team for direct freight scheduling.