The Inlet Disk Valve, cataloged under National Stock Number 4240-01-663-8531, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Avon Protection Systems Incorporated Dba Avon Protection Systems Inc. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Inlet Disk Valve |
| FSC / FSG | 4240 — Safety and Rescue Equipment (FSG 42) |
| Manufacturers | Avon Protection Systems Incorporated Dba Avon Protection Systems Inc (CAGE 1LEW5) |
| Parameter | Value |
|---|---|
| NSN | 4240-01-663-8531 |
| Primary Part Number | 72003/8 |
| Item Name | Inlet Disk Valve |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Avon Protection Systems Incorporated Dba Avon Protection Systems Inc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 72003/8 PRIMARY | Avon Protection Systems Incorporated Dba Avon Protection Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| MD0565 | 5/9 Secondary reference Crew Systems Corporation |
NSN 4240-01-663-8531 is a Inlet Disk Valve, manufactured by Avon Protection Systems Incorporated Dba Avon Protection Systems Inc, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-663-8531 has 1 manufacturer part number on file: 72003/8 (Avon Protection Systems Incorporated Dba Avon Protection Systems Inc).
1 possible match (shared part number, not a government interchangeability claim): 5895-01-665-4730. Verify interchangeability with system specifications before substitution.
Possible hazard — SDS may be required (DLA HMIC P). 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.