The Insert,flapper Check, cataloged under National Stock Number 4820-01-167-4974, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Tactair Fluid Controls Inc. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-167-4974 |
| Primary Part Number | FA450C-47-0211 |
| Item Name | Insert,flapper Check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Tactair Fluid Controls Inc |
| Status | ACTIVE |
| General Characteristics Item Description | SEMI-CIRCULAR HINGED FLAPPERS ATTACHED TO FLANGE FOR INSERTION INTO 5.000 IN. DIA TUBE; FLANGE HAS TEN EQUALLY SPACED LOBES,EACH CONTAINING A 0.281 IN. HOLE CENTERED ON 6.375 IN. DIA CIRCLE; OVERALL DIA 6.755 IN.; OPERATING PRESSURE 21.0 PSIG; OPERATING TEMPERATURE -65.0 TO 175.0 DEGREES F 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 |
|---|---|
| FA450C-47-0211 PRIMARY | Tactair Fluid Controls Inc (USA) |
| Reference | Meaning |
|---|---|
| LE284-0006-0211 | 7/2 Vendor item drawing reference The Boeing Company Div Legacy Am&m |
| FA450C-47-0211 | 5/9 Secondary reference U.S. Government activity |
| FA450C-47-0211 | 5/9 Secondary reference The Boeing Company Div Legacy Am&m |
NSN 4820-01-167-4974 is a Insert,flapper Check, manufactured by Tactair Fluid Controls Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-167-4974 has 1 manufacturer part number on file: FA450C-47-0211 (Tactair Fluid Controls Inc).
Key specifications for FA450C-47-0211: General Characteristics Item Description: SEMI-CIRCULAR HINGED FLAPPERS ATTACHED TO FLANGE FOR INSERTION INTO 5.000 IN. DIA TUBE; FLANGE HAS TEN EQUALLY SPACED LOBES,EACH CONTAINING A 0.281 IN. HOLE CENTERED ON 6.375 IN. DIA CIRCLE; OVERALL DIA 6.755 IN.; OPERATING PRESSURE 21.0 PSIG; OPERATING TEMPERATURE -65.0 TO 175.0 DEGREES F IN; End Item Identification: B-1B AIRCRAFT. 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.