The Test Kit,back Flow Preventer, cataloged under National Stock Number 6680-01-177-3175, is classified within Federal Supply Class 6680 (Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Watts Regulator Company. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6680-01-177-3175 |
| Primary Part Number | TK9-A |
| Item Name | Test Kit,back Flow Preventer |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Watts Regulator Company |
| 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 |
NSN 6680-01-177-3175 is a Test Kit,back Flow Preventer, manufactured by Watts Regulator Company, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-01-177-3175 has 2 manufacturer part numbers on file: TK9-A (Watts Regulator Company), 40-200TK (Quality Supply Corp).
1 possible match (shared part number, not a government interchangeability claim): 6850-01-411-7393. Verify interchangeability with system specifications before substitution.
Key specifications for TK9-A: End Item Identification: WATTS MODEL 900 AND 909 SERIES BACK FLOW PREVENTERS.. 0 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.