The Diaphragm,valve,flat, cataloged under National Stock Number 4820-01-221-2211, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 4 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-221-2211 |
| Primary Part Number | D50667CP |
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Outside Diameter | 6.250 INCHES NOMINAL IN |
| Criticality Code Justification | ZZZY |
| Style Designator | FLAT |
| Material Thickness | 0.188 INCHES NOMINAL IN |
| Bolt Hole Quantity | 12 |
| Bolt Circle Diameter | 5.250 INCHES NOMINAL IN |
| Material | PLASTIC POLYAMIDE NYLON AND RUBBER CHLOROPRENE CLASS CR |
| Hole Diameter | 0.500 INCHES NOMINAL IN |
| Reference Number Differentiating Characteristics | CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| D50667CP | Naval Inventory Control Point Mechanicsburg (USA) |
| D50668 ITEM 5CP | Naval Inventory Control Point Mechanicsburg (USA) |
| D39747MRRCP | Naval Inventory Control Point Mechanicsburg (USA) |
| D50667 ITEM 5CP | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| D50667 ITEM 5 | 5/1 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
| D39747MRR | 3/1 Design control — primary reference Hunt Valve Company Inc Dba Union Flonetics |
| D50668 ITEM 5 | 5/1 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
| D50667 | D/9 Drawing number reference only Hunt Valve Company Inc Dba Union Flonetics |
NSN 4820-01-221-2211 is a Diaphragm,valve,flat, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-221-2211 has 4 manufacturer part numbers on file: D50667CP (Naval Inventory Control Point Mechanicsburg), D50668 ITEM 5CP (Naval Inventory Control Point Mechanicsburg), D39747MRRCP (Naval Inventory Control Point Mechanicsburg), D50667 ITEM 5CP (Naval Inventory Control Point Mechanicsburg).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-485-1820. Verify interchangeability with system specifications before substitution.
Key specifications for D50667CP: Outside Diameter: 6.250 INCHES NOMINAL IN; Criticality Code Justification: ZZZY; Style Designator: FLAT; Material Thickness: 0.188 INCHES NOMINAL IN. 9 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.