PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1655-00Diaphragm,valve,flat

Trac Regulator Co., Inc. Dba Trac Regulator Co Inc · NSN 4820-01-475-7877 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-475-7877 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-475-7877. Primary manufacturer part number: 1655-00.
Features
  • Diaphragm,valve,flat — FSC 4820
  • Style Designator: FLAT
  • Media for Which Designed: OIL
  • Material: RUBBER
  • 3 verified cross-references
  • Primary manufacturer: Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Rubber construction
General Description

The Diaphragm,valve,flat, cataloged under National Stock Number 4820-01-475-7877, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Trac Regulator Co., Inc. Dba Trac Regulator Co Inc. Government technical data includes 3 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-475-7877
Primary Part Number1655-00
Item NameDiaphragm,valve,flat
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerTrac Regulator Co., Inc. Dba Trac Regulator Co Inc
StatusACTIVE
Style DesignatorFLAT
Media for Which DesignedOIL
MaterialRUBBER
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
4820-00-369-3402406955 INTERCHANGEABLE
Disk,valve
Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road)
5330-01-140-72421R301 INTERCHANGEABLE
Seal,nonmetallic Round Section
W.w. Grainger, Inc. Div Government Sales Division
5998-01-370-0563165500 INTERCHANGEABLE
Circuit Card Assembly
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
4820-01-467-776840695-5 INTERCHANGEABLE
Valve,regulating,fluid Pressure
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-474-67441631-00 INTERCHANGEABLE
Seat,valve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-475-78821619-00 INTERCHANGEABLE
Disk,valve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-475-78871623-00 INTERCHANGEABLE
Diaphragm,valve,flat
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-475-79791638-00 INTERCHANGEABLE
Valve,angle
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-475-81181620-00 INTERCHANGEABLE
Stem,fluid Valve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-475-81251656-00 INTERCHANGEABLE
Stem,fluid Valve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
Cross-Reference Index
Part NumberManufacturer
40695-5 Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
1655-00 PRIMARY Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
40695-5 PC 31 Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
Related Parts
4820-00-369-3402INTERCHANGEABLE
DISK,VALVE
406955
5330-01-140-7242INTERCHANGEABLE
SEAL,NONMETALLIC ROUND SECTION
1R301
5998-01-370-0563INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
165500
4820-01-467-7768INTERCHANGEABLE
VALVE,REGULATING,FLUID PRESSURE
40695-5
4820-01-474-6744INTERCHANGEABLE
SEAT,VALVE
1631-00
4820-01-475-7882INTERCHANGEABLE
DISK,VALVE
1619-00
4820-01-475-7887INTERCHANGEABLE
DIAPHRAGM,VALVE,FLAT
1623-00
4820-01-475-7979INTERCHANGEABLE
VALVE,ANGLE
1638-00
4820-01-475-8118INTERCHANGEABLE
STEM,FLUID VALVE
1620-00
4820-01-475-8125INTERCHANGEABLE
STEM,FLUID VALVE
1656-00
4820-01-475-8210INTERCHANGEABLE
VALVE,FLOW CONTROL
1640-00
4820-01-475-8233INTERCHANGEABLE
RETAINER,DISK,VALVE
1654-00

Frequently Asked Questions

What is NSN 4820-01-475-7877?

NSN 4820-01-475-7877 is a Diaphragm,valve,flat, manufactured by Trac Regulator Co., Inc. Dba Trac Regulator Co Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-475-7877?

NSN 4820-01-475-7877 has 3 cross-referenced part numbers: 40695-5 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 1655-00 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 40695-5 PC 31 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc).

What NSN replaces 4820-01-475-7877?

There are 12 known substitutes for 4820-01-475-7877: 4820-00-369-3402, 5330-01-140-7242, 5998-01-370-0563 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1655-00?

Key specifications for 1655-00: Style Designator: FLAT; Special Features: MATERIAL IS BUNA-N; Media for Which Designed: OIL; End Item Identification: NHA CAGE 55378 P/N 40695-501 2" TRAC STYLE 'FA' BACK PRESSURE REGULATING VALVE ASSEMBLY LUBE OIL SERVICE. 5 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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