PartsTable TECHNICAL DATA SHEET

JULY 2026Technical Data Sheet

N3781994Diaphragm,valve,flat

Name: N3781994
SKU: 4820-00-621-5755

Leslie Controls, Inc. Dba Leslie Controls Inc · NSN 4820-00-621-5755 · FSC 4820 · No Item Name Available

Verified by PartsTable

NSN 4820-00-621-5755 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-621-5755. Primary manufacturer part number: N3781994.

4820-00-621-5755 — No Item Name Available illustration

Features

Diaphragm,valve,flat — FSC 4820
Material: STEEL CORROSION RESISTING
5 verified cross-references
Primary manufacturer: Leslie Controls, Inc. Dba Leslie Controls Inc

Applications

Flow control in piping systems
Pressure regulation
Steam and fluid isolation
Applications requiring Steel Corrosion Resisting construction

General Description

The Diaphragm,valve,flat, cataloged under National Stock Number 4820-00-621-5755, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Leslie Controls, Inc. Dba Leslie Controls Inc. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications

Parameter	Value
NSN	4820-00-621-5755
Primary Part Number	N3781994
Item Name	Diaphragm,valve,flat
FSC / FSG	4820 / 48 — No Item Name Available
Manufacturer	Leslie Controls, Inc. Dba Leslie Controls Inc
Status	CANCELLED
Material	STEEL CORROSION RESISTING

Lifecycle & Compliance

Acquisition Status	CANCELLED
HAZMAT	No

⇄ Verified Substitutes 11

5330-00-026-339537819 INTERCHANGEABLE

Gasket

A. O. Smith Corporation Dba a O Smith Corp

5365-00-558-1644 INTERCHANGEABLE

Spacer,ring

5330-00-641-6975288047 INTERCHANGEABLE

Seal,plain Encased

Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney

5307-00-881-244137819 INTERCHANGEABLE

Stud,plain

L3harris Technologies, Inc. Div Space and Airborne Systems

3110-00-902-3758071006 INTERCHANGEABLE

Bearing,roller,needle

Zf Active Safety and Electronics Us Llc Div Trw Commercial Steering Systems

4820-01-096-8899 INTERCHANGEABLE

Piston,valve

4710-01-396-518037819 INTERCHANGEABLE

Tube and Fittings,metallic

Exstar International Corporation

6150-01-412-765737819 INTERCHANGEABLE

Wiring Harness,branched

Tld Wollard Llc

5331-01-416-550037819 INTERCHANGEABLE

O-Ring

Alfa Laval Inc

5340-01-440-9304N38117 INTERCHANGEABLE

Seat,helical Compression Spring

Leslie Controls, Inc. Dba Leslie Controls Inc

Cross-Reference Index

Part Number	Manufacturer
18356N GRP8 PIE	Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
37819	Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
3781994	Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
A3781994	Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
N3781994 PRIMARY	Leslie Controls, Inc. Dba Leslie Controls Inc (USA)

Related Parts

5330-00-026-3395INTERCHANGEABLE

GASKET

37819

5365-00-558-1644INTERCHANGEABLE

SPACER,RING

5330-00-641-6975INTERCHANGEABLE

SEAL,PLAIN ENCASED

288047

5307-00-881-2441INTERCHANGEABLE

STUD,PLAIN

37819

3110-00-902-3758INTERCHANGEABLE

BEARING,ROLLER,NEEDLE

071006

4820-01-096-8899INTERCHANGEABLE

PISTON,VALVE

4710-01-396-5180INTERCHANGEABLE

TUBE AND FITTINGS,METALLIC

37819

6150-01-412-7657INTERCHANGEABLE

WIRING HARNESS,BRANCHED

37819

5331-01-416-5500INTERCHANGEABLE

O-RING

37819

5340-01-440-9304INTERCHANGEABLE

SEAT,HELICAL COMPRESSION SPRING

N38117

5977-01-590-5076INTERCHANGEABLE

ARM,ELECTRICAL CONTACT BRUSH

37819

Frequently Asked Questions

What is NSN 4820-00-621-5755?

NSN 4820-00-621-5755 is a Diaphragm,valve,flat, manufactured by Leslie Controls, Inc. Dba Leslie Controls Inc, classified under FSC 4820 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 4820-00-621-5755?

NSN 4820-00-621-5755 has 5 cross-referenced part numbers: 18356N GRP8 PIE (Leslie Controls, Inc. Dba Leslie Controls Inc), 37819 (Leslie Controls, Inc. Dba Leslie Controls Inc), 3781994 (Leslie Controls, Inc. Dba Leslie Controls Inc), A3781994 (Leslie Controls, Inc. Dba Leslie Controls Inc), N3781994 (Leslie Controls, Inc. Dba Leslie Controls Inc).

What NSN replaces 4820-00-621-5755?

There are 11 known substitutes for 4820-00-621-5755: 5330-00-026-3395, 5365-00-558-1644, 5330-00-641-6975 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of N3781994?

Key specifications for N3781994: Material: STEEL CORROSION RESISTING. 1 total characteristics are documented in the Federal Logistics Information System.

Is NSN 4820-00-621-5755 still in active supply?

NSN 4820-00-621-5755 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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