PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

81777-4Valve,safety Relief

Waterous Company · NSN 4820-01-130-4074 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-130-4074 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-130-4074. Primary manufacturer part number: 81777-4.
Features
  • Valve,safety Relief — FSC 4820
  • 8 verified cross-references
  • Primary manufacturer: Waterous Company
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-01-130-4074, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Waterous Company. This item has 8 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Catalog Facts
Item NameValve,safety Relief
FSC / FSG4820 — No Item Name Available (FSG 48)
ManufacturersOshkosh Defense Llc (CAGE 75Q65); Waterous Company (CAGE 79218); Oshkosh Corp (CAGE 45152); Tld Wollard Llc (CAGE 44185)
Technical Specifications
ParameterValue
NSN4820-01-130-4074
Primary Part Number81777-4
Item NameValve,safety Relief
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerWaterous Company
StatusCANCELLED
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
4920-00-037-7281807444 INTERCHANGEABLE
Guide,dummy
Curtiss-Wright Controls, Inc. Div Actuation Division
6685-00-111-1123163273 INTERCHANGEABLE
Gage,pressure,dial Indicating
Ametek, Inc. Div Aerospace & Defense
3110-00-155-6518MA1211UBVV1 INTERCHANGEABLE
Bearing,roller,cylindrical
Ntn Bearing Corporation of America
5340-00-235-18018707 INTERCHANGEABLE
Hasp,hinged
Stefanowicz & Lutz Inc Dba Merit Metal Products Corp
5930-00-548-9421726322 INTERCHANGEABLE
Switch,push-Pull
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
5950-00-648-0924 INTERCHANGEABLE
Transformer,audio Frequency
1620-00-738-0719 INTERCHANGEABLE
Piston,steer Damper
4820-00-978-8515 INTERCHANGEABLE
Valve,angle
4730-01-023-85348707 INTERCHANGEABLE
Sleeve,flared,tube Fitting
Caterpillar Inc Div Caterpillar Defense
5365-01-042-24968707 INTERCHANGEABLE
Spacer,sleeve
Halsit Holdings Llc Div Halsit Holdings, Llc Dba Abbatron
Cross-Reference Index
Part NumberManufacturer
45128AX Oshkosh Defense Llc (USA)
80744 Waterous Company (USA)
80744-4 Waterous Company (USA)
EE34827 Oshkosh Corp (USA)
81777-4 PRIMARY Waterous Company (USA)
MP-122-A Tld Wollard Llc (USA)
45128AX Oshkosh Corp (USA)
8707 Waterous Company (USA)
Related Parts
4920-00-037-7281INTERCHANGEABLE
GUIDE,DUMMY
807444
6685-00-111-1123INTERCHANGEABLE
GAGE,PRESSURE,DIAL INDICATING
163273
3110-00-155-6518INTERCHANGEABLE
BEARING,ROLLER,CYLINDRICAL
MA1211UBVV1
5340-00-235-1801INTERCHANGEABLE
HASP,HINGED
8707
5930-00-548-9421INTERCHANGEABLE
SWITCH,PUSH-PULL
726322
5950-00-648-0924INTERCHANGEABLE
TRANSFORMER,AUDIO FREQUENCY
1620-00-738-0719INTERCHANGEABLE
PISTON,STEER DAMPER
4820-00-978-8515INTERCHANGEABLE
VALVE,ANGLE
4730-01-023-8534INTERCHANGEABLE
SLEEVE,FLARED,TUBE FITTING
8707
5365-01-042-2496INTERCHANGEABLE
SPACER,SLEEVE
8707
5985-01-123-8296INTERCHANGEABLE
ATTENUATOR,VARIABLE
CP354MH4
5930-01-200-4641INTERCHANGEABLE
SWITCH
817-774

Frequently Asked Questions

What is NSN 4820-01-130-4074?

NSN 4820-01-130-4074 is a Valve,safety Relief, manufactured by Waterous Company, classified under FSC 4820 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 4820-01-130-4074?

NSN 4820-01-130-4074 has 8 cross-referenced part numbers: 45128AX (Oshkosh Defense Llc), 80744 (Waterous Company), 80744-4 (Waterous Company), EE34827 (Oshkosh Corp), 81777-4 (Waterous Company) and 3 more.

What NSN replaces 4820-01-130-4074?

There are 12 known substitutes for 4820-01-130-4074: 4920-00-037-7281, 6685-00-111-1123, 3110-00-155-6518 and 9 more. Verify interchangeability with system specifications before substitution.

Is NSN 4820-01-130-4074 still in active supply?

NSN 4820-01-130-4074 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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