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521-0055 — VALVE,POSITIVE CRANKCASE VENTILA

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

521-0055: VALVE,POSITIVE CRANKCASE VENTILA.

VALVE,POSITIVE CRANKCASE VENTILA. Key specifications include special_features: DIESEL ENGINE, part_name_assigned_by_controlling_agency: VALVE,POSITIVE CRANKCASE VENTILATION. This part is cataloged in the U.S.

Government catalog under NSN 2990-01-697-0960, 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
521-0055
NSN: 2990-01-697-0960
FSC: 2990 — Miscellaneous Engine Accessories, Nonaircraft
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
special_featuresDIESEL ENGINE
part_name_assigned_by_controlling_agencyVALVE,POSITIVE CRANKCASE VENTILATION
NSN2990-01-697-0960
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available VALVE,POSITIVE CRANKCASE VENTILA TITLE COMPONENT PN 521-0055 MFR VALVE,POSITIVE CRANKCA
TECHNICAL CHARACTERISTICS
SPECIAL FEATURESDIESEL ENGINE
PART NAME ASSIGNED BY CONTROLLING AGENCYVALVE,POSITIVE CRANKCASE VENTILATION
OTHER ITEMS IN FSC 2990 — Miscellaneous Engine Accessories, Nonaircraft
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
2990-00-096-8607 2990-00-390-3445 2990-00-459-7255 2990-00-536-2962 2990-00-903-8226 2990-01-151-5443
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 521-0055?
521-0055 is a VALVE,POSITIVE CRANKCASE VENTILA.
What is the NSN for 521-0055?
521-0055 is cataloged in the U.S. Government catalog under NSN 2990-01-697-0960. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
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.