The Flapper,valve, cataloged under National Stock Number 4820-01-140-4037, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Rockwell Collins, Inc. Dba Rc Displays Systems. 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. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-140-4037 |
| Primary Part Number | 37481-1 |
| Item Name | Flapper,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Rockwell Collins, Inc. Dba Rc Displays Systems |
| Status | ACTIVE |
| General Characteristics Item Description | NEOPRENE PER MIL-R-6855,CLASS 2,TYPE A; 1.500 IN. LG O/A; 0.750 IN. W O/A; 0.015 IN. THK O/A 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 |
|---|---|
| 37481-1 PRIMARY | Rockwell Collins, Inc. Dba Rc Displays Systems (USA) |
NSN 4820-01-140-4037 is a Flapper,valve, manufactured by Rockwell Collins, Inc. Dba Rc Displays Systems, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-140-4037 has 1 manufacturer part number on file: 37481-1 (Rockwell Collins, Inc. Dba Rc Displays Systems).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-383-7004. Verify interchangeability with system specifications before substitution.
Key specifications for 37481-1: General Characteristics Item Description: NEOPRENE PER MIL-R-6855,CLASS 2,TYPE A; 1.500 IN. LG O/A; 0.750 IN. W O/A; 0.015 IN. THK O/A IN. 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.