The Valve,topping, cataloged under National Stock Number 4220-01-580-0993, is classified within Federal Supply Class 4220 (Marine Lifesaving and Diving Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Mirada Research & Manufacturing, Inc.. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4220-01-580-0993 |
| Primary Part Number | B-51085 |
| Item Name | Valve,topping |
| FSC / FSG | 4220 / 42 — Marine Lifesaving and Diving Equipment |
| Manufacturer | Mirada Research & Manufacturing, Inc. |
| Status | ACTIVE |
| Surface Treatment | ANODIZE |
| Material | ALUMINUM ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4220-01-580-0993 is a Valve,topping, manufactured by Mirada Research & Manufacturing, Inc., classified under FSC 4220, Marine Lifesaving and Diving Equipment. Status: active.
NSN 4220-01-580-0993 has 2 manufacturer part numbers on file: B-51085 (Mirada Research & Manufacturing, Inc.), B-51085 (Rfd (australia) Pty Ltd Survitec Group Australia).
Key specifications for B-51085: Overall Height: 1.625 INCHES NOMINAL IN; Special Features: PINNED; 1-1/6-12UN-2A THREAD; 1-3/8 IHCH HEX; 6061-T6 ANODIZED BLACK PER MIL-A-8625, TYPE II, CLASS 2; 7/8 INCH INLET DIAMETER; 1-5/8 INCH STANDOFF ABOVE FLANGE A; Surface Treatment: ANODIZE; Material: ALUMINUM ALLOY. 2 specifications are 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.