The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-00-229-5237, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Gast Mfg Corp. Government technical data includes 20 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 | 4820-00-229-5237 |
| Primary Part Number | AA550CP |
| Item Name | Valve,regulating,fluid Pressure |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Gast Mfg Corp |
| Status | ACTIVE |
| Flow Control Device | CONE |
| Valve Stem Design | SINGLE SEAT |
| First End Thread Direction | RIGHT-HAND |
| Second End Relationship with First End | NOT IDENTICAL |
| Body Style | STRAIGHT THRU |
| Regulation Type | MANUAL SINGLE STAGE |
| First End Style Designator | PLAIN |
| Temp Rating | 175.0 FAHRENHEIT MAXIMUM DEGF |
| End Connection Quantity | 2 |
| Manual Control Method | KNOB |
| Valve Loading Method | SPRING |
| Second End Style Designator | PLAIN |
| First End Connection Type | THREADED EXTERNAL PIPE |
| Material | ALUMINUM SEAT |
| Material | ALUMINUM STEM |
| Material | ALUMINUM FLOW CONTROL DEVICE |
| Second End Connection Type | UNTHREADED INTERNAL TUBE |
| Thread Size and Series/type Designator | 1/4-18 NPT FIRST END |
| Filter | NOT INCLUDED |
| Second End Outside Diameter Tube Accommodated | 0.156 INCHES NOMINAL IN |
| 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 |
|---|---|
| AA550CP PRIMARY | Gast Mfg Corp (USA) |
NSN 4820-00-229-5237 is a Valve,regulating,fluid Pressure, manufactured by Gast Mfg Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-229-5237 has 1 manufacturer part number on file: AA550CP (Gast Mfg Corp).
Key specifications for AA550CP: Flow Control Device: CONE; Valve Stem Design: SINGLE SEAT; First End Thread Direction: RIGHT-HAND; Second End Relationship with First End: NOT IDENTICAL. 20 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.