PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-I-20037Indicator,sight,liquid

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 6680-00-290-7299 · FSC 6680 · No Item Name Available
Verified by PartsTable
NSN 6680-00-290-7299 — this item is cataloged by the U.S. Government under National Stock Number 6680-00-290-7299. Primary manufacturer part number: MIL-I-20037.
Features
  • Indicator,sight,liquid — FSC 6680
  • Maximum Working Pressure: 100.0 POUNDS PER SQUARE INCH (PSI) LBS
  • Data Furnishing Method: CLEAR WINDOW
  • Nominal Thread Size: UNABLE TO DECODE
  • Sight Diameter: 0.750 INCHES NOMINAL IN
  • Style Designator: GAGE VALVE
  • Thread Quantity Per Inch: UNABLE TO DECODE
  • Media for Which Designed: ANY ACCEPTABLE
Applications
  • Applications requiring Copper Alloy and Glass construction
General Description

The Indicator,sight,liquid, cataloged under National Stock Number 6680-00-290-7299, is classified within Federal Supply Class 6680 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference 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
NSN6680-00-290-7299
Primary Part NumberMIL-I-20037
Item NameIndicator,sight,liquid
FSC / FSG6680 / 66 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Maximum Working Pressure100.0 POUNDS PER SQUARE INCH (PSI) LBS
Data Furnishing MethodCLEAR WINDOW
Nominal Thread SizeUNABLE TO DECODE
Sight Diameter0.750 INCHES NOMINAL IN
Style DesignatorGAGE VALVE
Thread Quantity Per InchUNABLE TO DECODE
Media for Which DesignedANY ACCEPTABLE
Furnished DataLIQUID LEVEL
Guard Rod Quantity4
Thread Series DesignatorUNABLE TO DECODE
MaterialCOPPER ALLOY AND GLASS
End Connection TypeUNABLE TO DECODE
Nominal Pipe Size for Which DesignedUNABLE TO DECODE
Thread DirectionUNABLE TO DECODE
Distance Between Mounting Facility Centers23.250 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
6680-00-290-7300 INTERCHANGEABLE
Indicator,sight,liquid
6680-00-290-7301 INTERCHANGEABLE
Indicator,sight,liquid
6680-00-290-7302 INTERCHANGEABLE
Indicator,sight,liquid
6680-00-290-7304 INTERCHANGEABLE
Indicator,sight,liquid
6680-01-115-6125 INTERCHANGEABLE
Indicator,sight,liquid
6680-01-133-67352448-012 INTERCHANGEABLE
Indicator,sight,liquid
Clark-Reliance Llc Dba Jacoby-Tarbox
6680-01-186-0368F2045-SGI-I-M-GWT-PA INTERCHANGEABLE
Indicator,sight,liquid
American Society for Testing and Materials Dba Astm International
6680-01-186-0369EEP54-ASX-15IN-TY-1-CL-A INTERCHANGEABLE
Indicator,sight,liquid
Ernst Flow Industries Llc Div Ernst Flow Industries
6680-01-194-2549EEP53A-FLG-15-375IN-TY 1-CL A INTERCHANGEABLE
Indicator,sight,liquid
Ernst Flow Industries Llc Div Ernst Flow Industries
6680-01-417-3494EEP54AFLG-TY2CLA 28.75IN CTR INTERCHANGEABLE
Indicator,sight,liquid
Ernst Flow Industries Llc Div Ernst Flow Industries
Cross-Reference Index
Part NumberManufacturer
MIL-I-20037 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
6680-00-290-7300INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
6680-00-290-7301INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
6680-00-290-7302INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
6680-00-290-7304INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
6680-01-115-6125INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
6680-01-133-6735INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
2448-012
6680-01-186-0368INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
F2045-SGI-I-M-GWT-PA
6680-01-186-0369INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
EEP54-ASX-15IN-TY-1-CL-A
6680-01-194-2549INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
EEP53A-FLG-15-375IN-TY 1-CL A
6680-01-417-3494INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
EEP54AFLG-TY2CLA 28.75IN CTR
6680-01-446-4645INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
6680-01-498-1501INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID

Frequently Asked Questions

What is NSN 6680-00-290-7299?

NSN 6680-00-290-7299 is a Indicator,sight,liquid, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 6680 (No Item Name Available). Status: active.

What are the part numbers for NSN 6680-00-290-7299?

NSN 6680-00-290-7299 has 1 cross-referenced part number: MIL-I-20037 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 6680-00-290-7299?

There are 12 known substitutes for 6680-00-290-7299: 6680-00-290-7300, 6680-00-290-7301, 6680-00-290-7302 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-I-20037?

Key specifications for MIL-I-20037: End Item Identification: POSEIDON; Maximum Working Pressure: 100.0 POUNDS PER SQUARE INCH (PSI) LBS; Data Furnishing Method: CLEAR WINDOW; Nominal Thread Size: UNABLE TO DECODE. 18 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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