NSN 4820-01-520-4811 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-520-4811. Manufacturer of record part number: 188A-1-1/2IN.
Also searched as4820-01-520-4811 ·
4820015204811 ·
NIIN 015204811 ·
01-520-4811 ·
FSC 4820 Valves, Nonpowered · CAGE 79227 · 188A-1-1/2IN
Body Style: ANGLE GIVE "ADQM" AND "ADQN" ONLY IF FLANGED ONE OR TWO ENDS
First End Style Designator: PLAIN
End Connection Quantity: 2
First End Connection Type: THREADED INTERNAL PIPE
Temp Adjustability: NOT ADJUSTABLE
First End Nominal Pipe Size Accommodated: 1.500 INCHES IN
Identification
NSN: 4820-01-520-4811
NIIN: 015204811
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 188A-1-1/2IN
Manufacturer: Watts Regulator Company
General Description
The Valve,vacuum Breaking, cataloged under National Stock Number 4820-01-520-4811, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Watts Regulator Company. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4820-01-520-4811
Primary Part Number
188A-1-1/2IN
Item Name
Valve,vacuum Breaking
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Watts Regulator Company
Status
ACTIVE
Temp Rating
180.0 FAHRENHEIT DEGF
Body Style
ANGLE GIVE "ADQM" AND "ADQN" ONLY IF FLANGED ONE OR TWO ENDS
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097
4820-00-000-0097 · Item name not on file
4820-00-001-0010
VALVE,ROTARY,SELECTOR
4820-00-001-0020
4820-00-001-0020 · Item name not on file
4820-00-001-0021
4820-00-001-0021 · Item name not on file
4820-00-001-0032
4820-00-001-0032 · Item name not on file
4820-00-001-0037
VALVE,SAFETY RELIEF
4820-00-001-0042
4820-00-001-0042 · Item name not on file
4820-00-001-1230
4820-00-001-1230 · Item name not on file
Frequently Asked Questions
What is NSN 4820-01-520-4811?
NSN 4820-01-520-4811 is a Valve,vacuum Breaking, manufactured by Watts Regulator Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-520-4811?
NSN 4820-01-520-4811 has 1 manufacturer part number on file: 188A-1-1/2IN (Watts Regulator Company).
What are the specifications of 188A-1-1/2IN?
Key specifications for 188A-1-1/2IN: Temp Rating: 180.0 FAHRENHEIT DEGF; Body Style: ANGLE GIVE "ADQM" AND "ADQN" ONLY IF FLANGED ONE OR TWO ENDS; First End Style Designator: PLAIN; End Connection Quantity: 2. 7 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-520-4811 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.