PartsTable
Technical Data Sheet

2303/21 — 2303/21

✓ Government record, cited
ALLIED SYSTEMS COMPANY DBA ALLIED SYSTEMS CO · GATE VALVE
PRODUCT OVERVIEW

2303/21: 2303/21.

The 2303/21 is a ALLIED SYSTEMS COMPANY DBA ALLIED SYSTEMS CO industrial component. This part is cataloged in the U.S. Government catalog under NSN 4820-01-457-3089, 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
2303/21
NSN: 4820-01-457-3089
NIINs: 014573089, 016712250
FSC: 4820 — Valves, Nonpowered
CAGE: 60848 — ALLIED SYSTEMS COMPANY DBA ALLIED SYSTEMS CO (USA)
SPECIFICATIONS
Part Number2303/21
ManufacturerALLIED SYSTEMS COMPANY DBA ALLIED SYSTEMS CO
NSN4820-01-457-3089
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 2303/21 · ALLIED SYSTEMS COMPANY DBA ALLIED SYSTEMS CO ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
CONNECTION STYLE: PLAIN,OPTIONAL END(PIPE) ALL ENDS
•
CONNECTION TYPE: THREADED INTERNAL PIPE ALL ENDS
•
STYLE DESIGNATOR: STRAIGHT THRU
•
BONNET TYPE: PACKING RETAINING
•
THREAD DIRECTION: RIGHT-HAND ALL ENDS
•
NOMINAL THREAD SIZE: 0.375 INCHES ALL ENDS IN
•
THREAD SERIES DESIGNATOR: NPT ALL ENDS
TECHNICAL CHARACTERISTICS
CONNECTION STYLEPLAIN,OPTIONAL END(PIPE) ALL ENDS
CONNECTION TYPETHREADED INTERNAL PIPE ALL ENDS
STYLE DESIGNATORSTRAIGHT THRU
BONNET TYPEPACKING RETAINING
THREAD DIRECTIONRIGHT-HAND ALL ENDS
NOMINAL THREAD SIZE0.375 INCHES ALL ENDS IN
END ITEM IDENTIFICATIONNIMITZ CLASS CVN
THREAD SERIES DESIGNATORNPT ALL ENDS
SUBSTITUTES & CROSS-REFERENCES 2
3/8-20SSOR-02-LReference document
Same NSN cross-reference
Reference document — Secondary reference
3/8 20SSOR-02-LLReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2303/21?
2303/21 is a 2303/21 manufactured by ALLIED SYSTEMS COMPANY DBA ALLIED SYSTEMS CO.
What parts can replace 2303/21?
There are 2 known substitutes for 2303/21: 3/8-20SSOR-02-L, 3/8 20SSOR-02-LL. Substitute compatibility should be verified for your specific system.
What is the NSN for 2303/21?
2303/21 is cataloged in the U.S. Government catalog under NSN 4820-01-457-3089. 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.