The Valve,check,oxygen System, cataloged under National Stock Number 4820-01-676-3434, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Swagelok Co. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-676-3434 |
| Primary Part Number | B-4CPA-2-350-SC11 |
| Item Name | Valve,check,oxygen System |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Swagelok Co |
| Status | ACTIVE |
| Operating Pressure | 350.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 0.25 INCHES IN |
| Nondefinitive Spec/std Data | B-4-CPA2-350-SC11 MODEL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| B-4CPA-2-350-SC11 PRIMARY | Swagelok Co (USA) |
NSN 4820-01-676-3434 is a Valve,check,oxygen System, manufactured by Swagelok Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-676-3434 has 1 manufacturer part number on file: B-4CPA-2-350-SC11 (Swagelok Co).
Key specifications for B-4CPA-2-350-SC11: Operating Pressure: 350.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Valve Size: 0.25 INCHES IN; Nondefinitive Spec/std Data: B-4-CPA2-350-SC11 MODEL; Special Features: BRASS INSERT/INSERT LOCK CW710R/EN 12163; O-RING BUNA N; POPPET BRASS 360/ASTM B16; SPRING 302 SS/ASTM A313; BODY BRASS 360/ASTM B16; ADJUSTING AND LOCKING SCREWS 316 SS/ASTM A276; LUBRICANT PTFE-BASED. ITEM: 1/4 MALE NPT, BRASS, CPA SERIES, 350 TO 600 PSI CRACKING PRESSURE, OXYGEN CLEAN.. 3 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.