PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4737D-G503Dehydrator Unit,nonreactivating

Howell Laboratories Inc Dba Howell Laboratories Inc · NSN 4440-01-203-0576 · FSC 4440 · No Item Name Available
Verified by PartsTable
NSN 4440-01-203-0576 — this item is cataloged by the U.S. Government under National Stock Number 4440-01-203-0576. Primary manufacturer part number: 4737D-G503.
Features
  • Dehydrator Unit,nonreactivating — FSC 4440
  • Nondefinitive Spec/std Data: 2 TYPE AND 3 CLASS
  • Body Overall Height: 59.500 INCHES NOMINAL IN
  • Accessory Components and Quantity: FLOW METER 1
  • Body Overall Length: 36.000 INCHES NOMINAL IN
  • Body Overall Width: 18.000 INCHES NOMINAL IN
  • 3 verified cross-references
  • Primary manufacturer: Howell Laboratories Inc Dba Howell Laboratories Inc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Dehydrator Unit,nonreactivating, cataloged under National Stock Number 4440-01-203-0576, is classified within Federal Supply Class 4440 (No Item Name Available) of the Furnace, Steam, Drying, Nuclear Reactors group. The primary manufacturer of record is Howell Laboratories Inc Dba Howell Laboratories Inc. Government technical data includes 5 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. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4440-01-203-0576
Primary Part Number4737D-G503
Item NameDehydrator Unit,nonreactivating
FSC / FSG4440 / 44 — No Item Name Available
ManufacturerHowell Laboratories Inc Dba Howell Laboratories Inc
StatusACTIVE
Nondefinitive Spec/std Data2 TYPE AND 3 CLASS
Body Overall Height59.500 INCHES NOMINAL IN
Accessory Components and QuantityFLOW METER 1
Body Overall Length36.000 INCHES NOMINAL IN
Body Overall Width18.000 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5999-00-035-9027 INTERCHANGEABLE
Contact,electrical
5365-00-050-96554737 INTERCHANGEABLE
Shim
Eaton Aerospace, Llc Dba Jackson South
4460-00-168-1928 INTERCHANGEABLE
Dehydrator,low Pres
6625-00-349-9924 INTERCHANGEABLE
Bridge,resistance
1680-00-868-72024737 INTERCHANGEABLE
Tube,torque
B/e Aerospace Inc Dba Interturbine
4810-01-101-55014737 INTERCHANGEABLE
Body Assy,valve
Eaton Corporation Dba Airframe Div Fuel & Motion Control Systems
5320-01-133-2221 INTERCHANGEABLE
Rivet,solid
4440-01-163-282444400DG503 INTERCHANGEABLE
Dehydrator
Howell Laboratories Inc Dba Howell Laboratories Inc
5905-01-173-8984604-288 INTERCHANGEABLE
Resistor,fixed,wire Wound,induct
Miller Electric Mfg. Llc
4440-01-227-2952 INTERCHANGEABLE
Dehydrator,low Pres
Cross-Reference Index
Part NumberManufacturer
4737 Howell Laboratories Inc Dba Howell Laboratories Inc (USA)
4737D-G503 PRIMARY Howell Laboratories Inc Dba Howell Laboratories Inc (USA)
MIL-D-23523 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
5999-00-035-9027INTERCHANGEABLE
CONTACT,ELECTRICAL
5365-00-050-9655INTERCHANGEABLE
SHIM
4737
4460-00-168-1928INTERCHANGEABLE
DEHYDRATOR,LOW PRES
6625-00-349-9924INTERCHANGEABLE
BRIDGE,RESISTANCE
1680-00-868-7202INTERCHANGEABLE
TUBE,TORQUE
4737
4810-01-101-5501INTERCHANGEABLE
BODY ASSY,VALVE
4737
5320-01-133-2221INTERCHANGEABLE
RIVET,SOLID
4440-01-163-2824INTERCHANGEABLE
DEHYDRATOR
44400DG503
5905-01-173-8984INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND,INDUCT
604-288
4440-01-227-2952INTERCHANGEABLE
DEHYDRATOR,LOW PRES
3020-01-239-5357INTERCHANGEABLE
GEAR,HELICAL
4737
4460-01-243-2498INTERCHANGEABLE
DEHYDRATOR,LOW PRES
4737D-G501

Frequently Asked Questions

What is NSN 4440-01-203-0576?

NSN 4440-01-203-0576 is a Dehydrator Unit,nonreactivating, manufactured by Howell Laboratories Inc Dba Howell Laboratories Inc, classified under FSC 4440 (No Item Name Available). Status: active.

What are the part numbers for NSN 4440-01-203-0576?

NSN 4440-01-203-0576 has 3 cross-referenced part numbers: 4737 (Howell Laboratories Inc Dba Howell Laboratories Inc), 4737D-G503 (Howell Laboratories Inc Dba Howell Laboratories Inc), MIL-D-23523 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 4440-01-203-0576?

There are 12 known substitutes for 4440-01-203-0576: 5999-00-035-9027, 5365-00-050-9655, 4460-00-168-1928 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 4737D-G503?

Key specifications for 4737D-G503: Nondefinitive Spec/std Data: 2 TYPE AND 3 CLASS; Body Overall Height: 59.500 INCHES NOMINAL IN; Special Features: 115 VAC,60 HZ,1 PHASE,25 AMP,30 SCFM VAC; Accessory Components and Quantity: FLOW METER 1. 6 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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