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Poppet Drain Cock

NSN: 4820-00-076-3521 | Model: 720B11
ITAR Registered seal

An item designed to drain fluids from fuel systems, tanks, filters, or similar items. It has a mounting end, a free flowing end, and a quick-acting nonmetallic sealed closure, usually spring loaded, that holds it in an off position. It requires no lubrication other than from the fluid being drained.

NSN Properties and Flags
NATO Stock Number
Yes - ITAR Controlled
Thread Class
3A 1ST end
Thread Direction
Right-hand 1ST end
Flow Control Device
Connection Style
Flared (tube) 1ST end
Valve Operation Method
Connection Type
Threaded external tube 1ST end
Thready Qty Per Inch (tpi)
20 1ST end
Maximum Operating Pressure
10.0 pounds per square inch 1ST response
Thread Size
0.437 inches 1ST end
Seat Angle
37.0 degrees 1ST end
Outside Diameter Tube Accommodated
0.250 inches 1ST end
Stainless steel flow control device
Media For Which Designed
Fuel/oil, hydrocarbon single response
Thread Series Designator
Unf 1ST end

Pricing and Availability

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NSN 4820-00-076-3521 Datasheet

Supply Class (FSC):
Nonpowered Valves
Cross Reference:
  • 720B11
  • HE284-5038-0001
Cage Codes:
  • Valve, Inc. Auto (CAGE 91511)
  • Rockwell International Corp (CAGE 89372)
Schedule B & Trade:
  • Schedule B: 8481909090 (NAICS 332911)

    Parts of taps, cocks, valves and similar appliances, Nisei

  • SITC: 74790

    Parts for taps, cocks, valves and similar appliances for pipes, boiler shells, tanks, etc.

  • End Use: 21180

    Industrial machines, other


N - Indicates there is no data in the humors and the nsn is in a fsc not generally suspected of containing hazardous materials.


A - Item does not contain precious metal.


- Represents items with no adp components


- The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.

Freight Information:
  • NMFC:

    051080 - Faucets, bibcocks, gates valves

  • WCC:

    572 - Iron or steel bars, (less than 35 feet)(see 822)

  • ACC:

    A - Supplies and equipment for aircraft and aerial targets, including aircraft and maintenance parts, aircraft accessories, aircraft

  • ADC:

    A - Shipment is not a consolidation and does not exceed 84 inches in any dimension.

  • LTL:

    W - Rating variable

  • SHC:

    Z - Other or no special handling required (sh)

  • TCC:

    Z - No special type of cargo code applicable

NSN Management Codes:
  • SOS
  • AAC
  • Quantity per pack
  • Unit of Measure
  • Shelf Life
  • Classification Control
  • Repariability

Questions & Answers:

What are the historical prices recorded for this stock number?
Historical data shows pricing from $630.18 to $1,050.30..
Does NSN 4820-00-076-3521 have a shelf life?
No. There is no shelf life applicable for this NSN.
What NATO entities are users of this NSN?
Department Of The Air Force, Department Of The Navy, Poland, Israel, Germany, Republic Of Korea, Greece, and Turkey
What is the NIIN of NSN 4820-00-076-3521?
000763521 or 00-076-3521
Does NSN 4820-00-076-3521 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 4820-00-076-3521?
No solicitations for this NSN.
When was this national stock number assigned to the federal catalog?
Jul 29, 1967