PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

18047Filter Duct Assembly

Drs Environmental Systems Inc · NSN 4520-01-042-4670 · FSC 4520 · No Item Name Available
Verified by PartsTable
NSN 4520-01-042-4670 — this item is cataloged by the U.S. Government under National Stock Number 4520-01-042-4670. Primary manufacturer part number: 18047.
Features
  • Filter Duct Assembly — FSC 4520
  • General Characteristics Item Description: CONSISTS OF 1 FILTER DUCT CLOSURE PART NO. 18039-1,1 FILTER DUCT CLOSURE PART NO. 18039-2,1 SUPPORT PART NO. 18038,2 GUIDE CHANNEL PART NO. 18067,1 SIDE CHANNEL PART NO. 18042,1 SIDE CHANNEL PART NO. 18066,DOW CORNING SEALANT SILASTIC 732RTV ADHESIVE ASREQUIRED
  • 3 verified cross-references
  • Primary manufacturer: Drs Environmental Systems Inc
Applications
  • Fluid filtration and purification
  • Engine intake air cleaning
  • Hydraulic system protection
General Description

The Filter Duct Assembly, cataloged under National Stock Number 4520-01-042-4670, is classified within Federal Supply Class 4520 (No Item Name Available) of the Plumbing, Heating, and Waste Disposal group. The primary manufacturer of record is Drs Environmental Systems Inc. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4520-01-042-4670
Primary Part Number18047
Item NameFilter Duct Assembly
FSC / FSG4520 / 45 — No Item Name Available
ManufacturerDrs Environmental Systems Inc
StatusACTIVE
General Characteristics Item DescriptionCONSISTS OF 1 FILTER DUCT CLOSURE PART NO. 18039-1,1 FILTER DUCT CLOSURE PART NO. 18039-2,1 SUPPORT PART NO. 18038,2 GUIDE CHANNEL PART NO. 18067,1 SIDE CHANNEL PART NO. 18042,1 SIDE CHANNEL PART NO. 18066,DOW CORNING SEALANT SILASTIC 732RTV ADHESIVE ASREQUIRED
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
4730-00-050-4208SAE-AS15003-1P INTERCHANGEABLE
Fitting,lubrication
Sae International Dba Sae International
3110-00-100-6156MS19059-2420 INTERCHANGEABLE
Ball,bearing
American Society for Testing and Materials Dba Astm International
5133-00-189-9292 INTERCHANGEABLE
Drill,twist
4710-00-331-6430 INTERCHANGEABLE
Tube Assembly,metal
5935-00-873-3911819-B3800B-75-M5 INTERCHANGEABLE
Connector,receptacle,electrical
Lax Electronics, Inc. Dba Automatic Connector Div Automatic Connector
3030-01-140-4873 INTERCHANGEABLE
Belt,positive Drive
5905-01-337-955018-047 INTERCHANGEABLE
Resistor,variable,nonwire Wound,
Palomar Products, Inc.
4710-01-396-514218047 INTERCHANGEABLE
Tube Assembly,metal
Westerbeke Corporation
7310-01-476-8840 INTERCHANGEABLE
Container,liquid
Cross-Reference Index
Part NumberManufacturer
18047 Drs Environmental Systems Inc (USA)
18047 Engineered Air Systems, Inc. Dba Drs Sustainment Systems (USA)
18047 Hdt Expeditionary Systems Inc (USA)
Related Parts
4730-00-050-4208INTERCHANGEABLE
FITTING,LUBRICATION
SAE-AS15003-1P
3110-00-100-6156INTERCHANGEABLE
BALL,BEARING
MS19059-2420
5133-00-189-9292INTERCHANGEABLE
DRILL,TWIST
4710-00-331-6430INTERCHANGEABLE
TUBE ASSEMBLY,METAL
5935-00-873-3911INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
819-B3800B-75-M5
3030-01-140-4873INTERCHANGEABLE
BELT,POSITIVE DRIVE
5905-01-337-9550INTERCHANGEABLE
RESISTOR,VARIABLE,NONWIRE WOUND,
18-047
4710-01-396-5142INTERCHANGEABLE
TUBE ASSEMBLY,METAL
18047
7310-01-476-8840INTERCHANGEABLE
CONTAINER,LIQUID

Frequently Asked Questions

What is NSN 4520-01-042-4670?

NSN 4520-01-042-4670 is a Filter Duct Assembly, manufactured by Drs Environmental Systems Inc, classified under FSC 4520 (No Item Name Available). Status: active.

What are the part numbers for NSN 4520-01-042-4670?

NSN 4520-01-042-4670 has 3 cross-referenced part numbers: 18047 (Drs Environmental Systems Inc), 18047 (Engineered Air Systems, Inc. Dba Drs Sustainment Systems), 18047 (Hdt Expeditionary Systems Inc).

What NSN replaces 4520-01-042-4670?

There are 9 known substitutes for 4520-01-042-4670: 4730-00-050-4208, 3110-00-100-6156, 5133-00-189-9292 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 18047?

Key specifications for 18047: General Characteristics Item Description: CONSISTS OF 1 FILTER DUCT CLOSURE PART NO. 18039-1,1 FILTER DUCT CLOSURE PART NO. 18039-2,1 SUPPORT PART NO. 18038,2 GUIDE CHANNEL PART NO. 18067,1 SIDE CHANNEL PART NO. 18042,1 SIDE CHANNEL PART NO. 18066,DOW CORNING SEALANT SILASTIC 732RTV ADHESIVE ASREQUIRED. 1 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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