PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

AA-500Valve,vac,priming

Gardner Denver Nash Llc Dba Gardner Denver Engineered Products Group Div Gardner Denver Nash · NSN 4820-01-228-0781 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-228-0781 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-228-0781. Primary manufacturer part number: AA-500.
Features
  • Valve,vac,priming — FSC 4820
  • Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
  • General Characteristics Item Description: HEIGHT MIN. 9.219 IN,MAX. 9.281 IN; INLET MIN. 4.484 IN,MAX. 4.516 IN,X MIN. 1.515 IN,MAX. 1.547 IN;THREADS ON INLET .500-13NC-4 THRU;OUTLET MIN. 3.796 IN,MAX 3.828 IN,X MIN. .859 IN MAX. .891 IN,X MIN. 1.062 IN,MAX. 1.124 IN IN
  • Criticality Code Justification: ZZZY
  • 3 verified cross-references
  • Primary manufacturer: Gardner Denver Nash Llc Dba Gardner Denver Engineered Products Group Div Gardner Denver Nash
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve,vac,priming, cataloged under National Stock Number 4820-01-228-0781, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Gardner Denver Nash Llc Dba Gardner Denver Engineered Products Group Div Gardner Denver Nash. Government technical data includes 3 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-228-0781
Primary Part NumberAA-500
Item NameValve,vac,priming
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerGardner Denver Nash Llc Dba Gardner Denver Engineered Products Group Div Gardner Denver Nash
StatusACTIVE
Reference Number Differentiating CharacteristicsMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
General Characteristics Item DescriptionHEIGHT MIN. 9.219 IN,MAX. 9.281 IN; INLET MIN. 4.484 IN,MAX. 4.516 IN,X MIN. 1.515 IN,MAX. 1.547 IN;THREADS ON INLET .500-13NC-4 THRU;OUTLET MIN. 3.796 IN,MAX 3.828 IN,X MIN. .859 IN MAX. .891 IN,X MIN. 1.062 IN,MAX. 1.124 IN IN
Criticality Code JustificationZZZY
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
2990-00-134-894742376 INTERCHANGEABLE
Pipe,exhaust
Walker Mfg Co
Cross-Reference Index
Part NumberManufacturer
AA-500 Gardner Denver Nash Llc Dba Gardner Denver Engineered Products Group Div Gardner Denver Nash (USA)
3277467 ASSY Naval Ship Systems Command (USA)
AA-500ASSY Gardner Denver Nash Llc Dba Gardner Denver Engineered Products Group Div Gardner Denver Nash (USA)
Related Parts
2990-00-134-8947INTERCHANGEABLE
PIPE,EXHAUST
42376

Frequently Asked Questions

What is NSN 4820-01-228-0781?

NSN 4820-01-228-0781 is a Valve,vac,priming, manufactured by Gardner Denver Nash Llc Dba Gardner Denver Engineered Products Group Div Gardner Denver Nash, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-228-0781?

NSN 4820-01-228-0781 has 3 cross-referenced part numbers: AA-500 (Gardner Denver Nash Llc Dba Gardner Denver Engineered Products Group Div Gardner Denver Nash), 3277467 ASSY (Naval Ship Systems Command), AA-500ASSY (Gardner Denver Nash Llc Dba Gardner Denver Engineered Products Group Div Gardner Denver Nash).

What NSN replaces 4820-01-228-0781?

There is 1 known substitute for 4820-01-228-0781: 2990-00-134-8947. Verify interchangeability with system specifications before substitution.

What are the specifications of AA-500?

Key specifications for AA-500: Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS; General Characteristics Item Description: HEIGHT MIN. 9.219 IN,MAX. 9.281 IN; INLET MIN. 4.484 IN,MAX. 4.516 IN,X MIN. 1.515 IN,MAX. 1.547 IN;THREADS ON INLET .500-13NC-4 THRU;OUTLET MIN. 3.796 IN,MAX 3.828 IN,X MIN. .859 IN MAX. .891 IN,X MIN. 1.062 IN,MAX. 1.124 IN IN; Criticality Code Justification: ZZZY. 3 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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