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K4551-2 — TRAP,STEAM

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

K4551-2: TRAP,STEAM.

The TRAP,STEAM is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY BODY, body_design: ANGLE PATTERN, design_type: THERMOSTATIC, furnished_items: STRAINER, inlet_connection_type: GROUND JOINT TAILPIECE W/UNION NUT, outlet_connection_type: GROUND JOINT TAILPIECE W/UNION NUT. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-032-1517, 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
K4551-2
NSN: 4730-00-032-1517
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 53059 — SPIRAX SARCO INC DBA SPIRAX SARCO (USA)
SPECIFICATIONS
materialCOPPER ALLOY BODY
body_designANGLE PATTERN
design_typeTHERMOSTATIC
furnished_itemsSTRAINER
inlet_connection_typeGROUND JOINT TAILPIECE W/UNION NUT
outlet_connection_typeGROUND JOINT TAILPIECE W/UNION NUT
nondefinitive_spec/std_data2 CLASS
rated_capacity_at_maximum_working_pressure2600.000 POUNDS OF WATER PER HOUR LBS
NSN4730-00-032-1517
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: K4551-2 · 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
•
DESIGN TYPE: THERMOSTATIC
•
INLET CONNECTION TYPE: GROUND JOINT TAILPIECE W/UNION NUT
•
NONDEFINITIVE SPEC/STD DATA: 2 CLASS
•
BODY DESIGN: ANGLE PATTERN
•
RATED CAPACITY AT MAXIMUM WORKING PRESSURE: 2600.000 POUNDS OF WATER PER HOUR LBS
•
MATERIAL: COPPER ALLOY BODY
•
FURNISHED ITEMS: STRAINER
TECHNICAL CHARACTERISTICS
DESIGN TYPETHERMOSTATIC
INLET CONNECTION TYPEGROUND JOINT TAILPIECE W/UNION NUT
NONDEFINITIVE SPEC/STD DATA2 CLASS
BODY DESIGNANGLE PATTERN
RATED CAPACITY AT MAXIMUM WORKING PRESSURE2600.000 POUNDS OF WATER PER HOUR LBS
MATERIALCOPPER ALLOY BODY
MATERIALSTEEL CORROSION RESISTING WORKING PARTS
FURNISHED ITEMSSTRAINER
OUTLET CONNECTION TYPEGROUND JOINT TAILPIECE W/UNION NUT
SUBSTITUTES & CROSS-REFERENCES 7
MILT2118Reference document
Same NSN cross-reference
Reference document — Identification reference
B34290Reference document
Same NSN cross-reference
Reference document — Secondary reference
J4551-2Reference document
Same NSN cross-reference
Reference document — Secondary reference
M2118-G-1-N-OSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
20137Reference document
Same NSN cross-reference
Reference document — Secondary reference
N194A1-2Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is K4551-2?
K4551-2 is a TRAP,STEAM.
What parts can replace K4551-2?
There are 7 known substitutes for K4551-2: MILT2118, B34290, J4551-2 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for K4551-2?
K4551-2 is cataloged in the U.S. Government catalog under NSN 4730-00-032-1517. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.