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437-251 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

HEATING ELEMENT,ELECTRICAL,IMMER. Key specifications include material: PLASTIC POLYVINYL CHLORIDE (PVC) OVERALL, reducer_type: CONCENTRIC, connection_type: UNTHREADED INTERNAL PIPE ALL ENDS, connection_style: PLAIN (TUBE) ALL ENDS, nominal_overall_length: 3.000 INCHES IN, specification/standard_data: 81346-ANSI/ASTMD2466 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-171-3340, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
437-251
NSN: 4730-01-171-3340
FSC: 4730
CAGE: 14889 — GEORGE FISCHER SLOANE, INC. (USA)
SPECIFICATIONS
materialPLASTIC POLYVINYL CHLORIDE (PVC) OVERALL
reducer_typeCONCENTRIC
connection_typeUNTHREADED INTERNAL PIPE ALL ENDS
connection_stylePLAIN (TUBE) ALL ENDS
nominal_overall_length3.000 INCHES IN
specification/standard_data81346-ANSI/ASTMD2466 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION
nominal_pipe_size_accommodated2.000 INCHES FIRST END IN
pipe_wall_thickness_designation_for_which_designedSCHEDULE 40 ALL ENDS
NSN4730-01-171-3340
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 437-251 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SPECIFICATION/STANDARD DATA: 81346-ANSI/ASTMD2466 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION
•
CONNECTION STYLE: PLAIN (TUBE) ALL ENDS
•
REDUCER TYPE: CONCENTRIC
•
NOMINAL PIPE SIZE ACCOMMODATED: 2.000 INCHES FIRST END IN
•
MATERIAL: PLASTIC POLYVINYL CHLORIDE (PVC) OVERALL
•
CONNECTION TYPE: UNTHREADED INTERNAL PIPE ALL ENDS
•
NOMINAL OVERALL LENGTH: 3.000 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
SPECIFICATION/STANDARD DATA81346-ANSI/ASTMD2466 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION
CONNECTION STYLEPLAIN (TUBE) ALL ENDS
REDUCER TYPECONCENTRIC
NOMINAL PIPE SIZE ACCOMMODATED2.000 INCHES FIRST END IN
MATERIALPLASTIC POLYVINYL CHLORIDE (PVC) OVERALL
CONNECTION TYPEUNTHREADED INTERNAL PIPE ALL ENDS
NOMINAL OVERALL LENGTH3.000 INCHES IN
NOMINAL PIPE SIZE ACCOMMODATED1.500 INCHES SECOND END IN
PIPE WALL THICKNESS DESIGNATION FOR WHICH DESIGNEDSCHEDULE 40 ALL ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
D2466Interchangeable
interchangeable cross-reference
interchangeable
402-094Interchangeable
interchangeable cross-reference
interchangeable
429-007Interchangeable
interchangeable cross-reference
interchangeable
N13107Interchangeable
interchangeable cross-reference
interchangeable
4002Interchangeable
interchangeable cross-reference
interchangeable
406-007Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 437-251?
437-251 is a HEATING ELEMENT,ELECTRICAL,IMMER.
What parts can replace 437-251?
There are 18 known substitutes for 437-251: D2466, 402-094, 429-007 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 437-251?
437-251 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-171-3340. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026