The Muffler,valve, cataloged under National Stock Number 4820-01-142-7940, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Nicholson Steam Trap Inc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-142-7940 |
| Primary Part Number | 5493000 |
| Item Name | Muffler,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Nicholson Steam Trap Inc |
| Status | ACTIVE |
| General Characteristics Item Description | PLASTIC;0.500 IN. SIZE;DESIGNED FOR 2- AND 3-WAY VALVES AND RELIEF VALVES 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 |
|---|---|
| 5493000 PRIMARY | Nicholson Steam Trap Inc (USA) |
| Reference | Meaning |
|---|---|
| 5760144 | 7/2 Vendor item drawing reference Naval Sea Systems Command |
| 144004 | 5/9 Secondary reference Nicholson Steam Trap Inc |
NSN 4820-01-142-7940 is a Muffler,valve, manufactured by Nicholson Steam Trap Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-142-7940 has 1 manufacturer part number on file: 5493000 (Nicholson Steam Trap Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5930-01-251-2411, 4130-01-555-4823. Verify interchangeability with system specifications before substitution.
Key specifications for 5493000: General Characteristics Item Description: PLASTIC;0.500 IN. SIZE;DESIGNED FOR 2- AND 3-WAY VALVES AND RELIEF VALVES IN; End Item Identification: AVITECH INC,TESTER,HYDRAULIC HOSE ASSEMBLY,MODEL 321A A. 1 specification is 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.