The Rollover Guide Block,valve, cataloged under National Stock Number 4820-01-133-4081, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Betts Industries, Inc.. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Rollover Guide Block,valve |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Oshkosh Defense Llc (CAGE 75Q65); Betts Industries, Inc. (CAGE 13226) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-133-4081 |
| Primary Part Number | 3640SL |
| Item Name | Rollover Guide Block,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Betts Industries, Inc. |
| 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 |
|---|---|
| 2DY848 | Oshkosh Defense Llc (USA) |
| 3640SL PRIMARY | Betts Industries, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 6238-4 | D/9 Drawing number reference only Betts Industries, Inc. |
| 6238-4 ITEM 5 | 5/9 Secondary reference Betts Industries, Inc. |
| 3640-SS | 5/9 Secondary reference Betts Industries, Inc. |
| 2DY848 | 5/9 Secondary reference Oshkosh Corp |
NSN 4820-01-133-4081 is a Rollover Guide Block,valve, manufactured by Betts Industries, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-133-4081 has 2 manufacturer part numbers on file: 2DY848 (Oshkosh Defense Llc), 3640SL (Betts Industries, Inc.).
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-133-7426, 4820-01-133-7768, 1005-01-464-1596. 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.