PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

550-3Indicator,sight,liquid

Curtiss-Wright Flow Control Corporation Dba Enertech Div Curtiss-Wright Flow Control · NSN 6680-01-140-8769 · FSC 6680 · No Item Name Available
Verified by PartsTable
NSN 6680-01-140-8769 — this item is cataloged by the U.S. Government under National Stock Number 6680-01-140-8769. Primary manufacturer part number: 550-3.
Features
  • Indicator,sight,liquid — FSC 6680
  • Material: COPPER ALLOY
  • Style Designator: DOUBLE-MOUNT, SHIELDED, FRONT OPENING
  • Thread Direction: UNABLE TO DECODE
  • Distance Between Mounting Facility Centers: 3.250 INCHES NOMINAL IN
  • Thread Series Designator: UNABLE TO DECODE
  • Data Furnishing Method: CLEAR WINDOW
  • Furnished Data: LIQUID LEVEL
Applications
  • Applications requiring Copper Alloy construction
General Description

The Indicator,sight,liquid, cataloged under National Stock Number 6680-01-140-8769, is classified within Federal Supply Class 6680 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Curtiss-Wright Flow Control Corporation Dba Enertech Div Curtiss-Wright Flow Control. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 2 manufacturers, 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
NSN6680-01-140-8769
Primary Part Number550-3
Item NameIndicator,sight,liquid
FSC / FSG6680 / 66 — No Item Name Available
ManufacturerCurtiss-Wright Flow Control Corporation Dba Enertech Div Curtiss-Wright Flow Control
StatusACTIVE
MaterialCOPPER ALLOY
Style DesignatorDOUBLE-MOUNT, SHIELDED, FRONT OPENING
Thread DirectionUNABLE TO DECODE
Distance Between Mounting Facility Centers3.250 INCHES NOMINAL IN
Thread Series DesignatorUNABLE TO DECODE
Data Furnishing MethodCLEAR WINDOW
Furnished DataLIQUID LEVEL
Media for Which DesignedOIL
Nominal Pipe Size for Which DesignedUNABLE TO DECODE
End Connection TypeUNABLE TO DECODE
Nominal Thread SizeUNABLE TO DECODE
Sight Height2.375 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
6680-00-106-9544550-3 INTERCHANGEABLE
Indicator,sight,liquid
Tobeyco Mfg, Co, Inc. Div Federal Brass Mfg.
5342-00-410-01198Z64D16 INTERCHANGEABLE
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Konecranes Inc Dba Milwaukee Parts Div Crane Pro Parts
5825-00-477-7848003822 INTERCHANGEABLE
Screen,exhaust
Moog Inc Div Moog Inc., Space and Defense - Salt Lake City
3110-00-555-54532-055-005-375 INTERCHANGEABLE
Bearing,ball,annular
Viking Pump, Inc
4820-00-618-72555503 INTERCHANGEABLE
Valve,globe
Dragon Valves Inc
7510-00-629-027355303 INTERCHANGEABLE
Tape,identification
Brady United States
1285-00-891-3296526-7727-003 INTERCHANGEABLE
Filter-Detector Ass
Clifton Metal Products Co Inc
4310-00-980-56015503 INTERCHANGEABLE
Crankcase,compressor
Quincy Compressor Division of Coltec Industries Inc Dba Quincy Compressor Div Quincy Compressor
5133-01-043-7623 INTERCHANGEABLE
Drill,twist
3030-01-057-5893550-3STS INTERCHANGEABLE
Lacing,belt,pin
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Cross-Reference Index
Part NumberManufacturer
550-3 Tobeyco Mfg, Co, Inc. Div Federal Brass Mfg. (USA)
550-3PL Tobeyco Mfg, Co, Inc. Div Federal Brass Mfg. (USA)
550 Curtiss-Wright Flow Control Corporation Dba Enertech Div Curtiss-Wright Flow Control (USA)
550-3 PRIMARY Curtiss-Wright Flow Control Corporation Dba Enertech Div Curtiss-Wright Flow Control (USA)
Related Parts
6680-00-106-9544INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
550-3
5342-00-410-0119INTERCHANGEABLE
LATCH,SPECIAL
8Z64D16
5825-00-477-7848INTERCHANGEABLE
SCREEN,EXHAUST
003822
3110-00-555-5453INTERCHANGEABLE
BEARING,BALL,ANNULAR
2-055-005-375
4820-00-618-7255INTERCHANGEABLE
VALVE,GLOBE
5503
7510-00-629-0273INTERCHANGEABLE
TAPE,IDENTIFICATION
55303
1285-00-891-3296INTERCHANGEABLE
FILTER-DETECTOR ASS
526-7727-003
4310-00-980-5601INTERCHANGEABLE
CRANKCASE,COMPRESSOR
5503
5133-01-043-7623INTERCHANGEABLE
DRILL,TWIST
3030-01-057-5893INTERCHANGEABLE
LACING,BELT,PIN
550-3STS
5340-01-079-1231INTERCHANGEABLE
CLIP,SPRING TENSION
6680-01-183-9057INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
550-3

Frequently Asked Questions

What is NSN 6680-01-140-8769?

NSN 6680-01-140-8769 is a Indicator,sight,liquid, manufactured by Curtiss-Wright Flow Control Corporation Dba Enertech Div Curtiss-Wright Flow Control, classified under FSC 6680 (No Item Name Available). Status: active.

What are the part numbers for NSN 6680-01-140-8769?

NSN 6680-01-140-8769 has 4 cross-referenced part numbers: 550-3 (Tobeyco Mfg, Co, Inc. Div Federal Brass Mfg.), 550-3PL (Tobeyco Mfg, Co, Inc. Div Federal Brass Mfg.), 550 (Curtiss-Wright Flow Control Corporation Dba Enertech Div Curtiss-Wright Flow Control), 550-3 (Curtiss-Wright Flow Control Corporation Dba Enertech Div Curtiss-Wright Flow Control).

What NSN replaces 6680-01-140-8769?

There are 12 known substitutes for 6680-01-140-8769: 6680-00-106-9544, 5342-00-410-0119, 5825-00-477-7848 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 550-3?

Key specifications for 550-3: Material: COPPER ALLOY; Style Designator: DOUBLE-MOUNT, SHIELDED, FRONT OPENING; Overall Height: 3.250 INCHES NOMINAL IN; Thread Direction: UNABLE TO DECODE. 13 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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