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S-403758 ✓ 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

NOZZLE ASSEMBLY,MONITOR TYPE,FIR. Key specifications include material: COPPER ALLOY FILTERING MEDIUM, end_item_identification: FIRE EQUIPMENT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-442-8111, 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
S-403758
NSN: 4730-01-442-8111
FSC: 4730
CAGE: 03670 — TYCO FIRE PRODUCTS LP (USA)
SPECIFICATIONS
materialCOPPER ALLOY FILTERING MEDIUM
end_item_identificationFIRE EQUIPMENT
NSN4730-01-442-8111
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: S-403758 · 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
•
MATERIAL: COPPER ALLOY FILTERING MEDIUM
TECHNICAL CHARACTERISTICS (FLIS)
END ITEM IDENTIFICATIONFIRE EQUIPMENT
MATERIALCOPPER ALLOY FILTERING MEDIUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
7057552Interchangeable
interchangeable cross-reference
interchangeable
7057552 ITEM 9Interchangeable
interchangeable cross-reference
interchangeable
420028Interchangeable
interchangeable cross-reference
interchangeable
70803Interchangeable
interchangeable cross-reference
interchangeable
7057552 ITEM 2Interchangeable
interchangeable cross-reference
interchangeable
7057552 ITEM 7Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S-403758?
S-403758 is a NOZZLE ASSEMBLY,MONITOR TYPE,FIR.
What parts can replace S-403758?
There are 8 known substitutes for S-403758: 7057552, 7057552 ITEM 9, 420028 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for S-403758?
S-403758 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-442-8111. 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