Operating Pressure: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
Valve Size for Which Designed: 1.0625 INCHES IN
Material: STEEL COMP 316
Thread Series Designator: UNIFIED NATIONAL JOINT FINE (UNJF)
Identification
NSN: 4820-01-451-3784
NIIN: 014513784
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
General Description
The Tailpiece,valve, cataloged under National Stock Number 4820-01-451-3784, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4820-01-451-3784
Item Name
Tailpiece,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Design Type
STRAIGHT
Valve Model Number for Which Designed
BD2445-01
Connection Type
THREADED EXTERNAL TUBE
Operating Pressure
3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
Valve Size for Which Designed
1.0625 INCHES IN
Material
STEEL COMP 316
Thread Series Designator
UNIFIED NATIONAL JOINT FINE (UNJF)
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items4
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
1650-01-451-3791541R066POSSIBLE MATCH
CAP,VALVE
Possible match (shared part number)Aerocontrolex Group, Inc. Dba Aero Fluid Products
1650-01-451-3795351R305POSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Aerocontrolex Group, Inc. Dba Aero Fluid Products
4820-01-451-4098441R093POSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)Aerocontrolex Group, Inc. Dba Aero Fluid Products
4820-01-451-4102431R186POSSIBLE MATCH
RETAINER,DISK,VALVE
Possible match (shared part number)Aerocontrolex Group, Inc. Dba Aero Fluid Products
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
661R041
3/2Design control — primary reference
U.S. Government activity
1402R004
D/9Drawing number reference only
U.S. Government activity
1402R004 ITEM 14
5/2Secondary reference
U.S. Government activity
Related Parts
1650-01-451-3791POSSIBLE MATCH
CAP,VALVE
541R066
1650-01-451-3795POSSIBLE MATCH
DISK,VALVE
351R305
4820-01-451-4098POSSIBLE MATCH
SEAT,VALVE
441R093
4820-01-451-4102POSSIBLE MATCH
RETAINER,DISK,VALVE
431R186
Frequently Asked Questions
What is NSN 4820-01-451-3784?
NSN 4820-01-451-3784 is a Tailpiece,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-451-3784?
4 possible matches (shared part number, not a government interchangeability claim): 1650-01-451-3791, 1650-01-451-3795, 4820-01-451-4098. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-01-451-3784?
Key specifications for 4820-01-451-3784: Design Type: STRAIGHT; Valve Model Number for Which Designed: BD2445-01; Connection Type: THREADED EXTERNAL TUBE; Operating Pressure: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS. 7 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-451-3784 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.