The Valve,safety Relief, cataloged under National Stock Number 4820-01-505-2728, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Gardner Denver Thomas, Inc. Dba Thomas Products Division. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Gardner Denver Thomas, Inc. Dba Thomas Products Division (CAGE 20024); Suburban Manufacturing, Llc (CAGE 7T076) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-505-2728 |
| Primary Part Number | 633957 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Gardner Denver Thomas, Inc. Dba Thomas Products Division |
| Status | ACTIVE |
| 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 |
|---|---|
| 633957 PRIMARY | Gardner Denver Thomas, Inc. Dba Thomas Products Division (USA) |
| 21410-0001 ITEM 5 | Suburban Manufacturing, Llc (USA) |
| Reference | Meaning |
|---|---|
| 21410-0001 | D/9 Drawing number reference only Suburban Manufacturing, Llc |
NSN 4820-01-505-2728 is a Valve,safety Relief, manufactured by Gardner Denver Thomas, Inc. Dba Thomas Products Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-505-2728 has 2 manufacturer part numbers on file: 633957 (Gardner Denver Thomas, Inc. Dba Thomas Products Division), 21410-0001 ITEM 5 (Suburban Manufacturing, Llc).
4 possible matches (shared part number, not a government interchangeability claim): 4810-01-505-2729, 6680-01-505-3455, 4820-01-505-4220. Verify interchangeability with system specifications before substitution.
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.