PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

S21015Cap Assembly,protective,muffler-

H20 Tank Inc U S Motors Div · NSN 2990-00-309-9574 · FSC 2990 · No Item Name Available
Verified by PartsTable
NSN 2990-00-309-9574 — this item is cataloged by the U.S. Government under National Stock Number 2990-00-309-9574. Primary manufacturer part number: S21015.
Features
  • Cap Assembly,protective,muffler- — FSC 2990
  • Material: STEEL
  • Pipe Outside Diameter Accommodated: 2.750 INCHES IN
  • 6 verified cross-references
  • Primary manufacturer: H20 Tank Inc U S Motors Div
Applications
  • Applications requiring Steel construction
General Description

The Cap Assembly,protective,muffler-, cataloged under National Stock Number 2990-00-309-9574, is classified within Federal Supply Class 2990 (No Item Name Available) of the Engine Accessories group. The primary manufacturer of record is H20 Tank Inc U S Motors Div. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN2990-00-309-9574
Primary Part NumberS21015
Item NameCap Assembly,protective,muffler-
FSC / FSG2990 / 29 — No Item Name Available
ManufacturerH20 Tank Inc U S Motors Div
StatusCANCELLED
MaterialSTEEL
Pipe Outside Diameter Accommodated2.750 INCHES IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
5905-00-158-5445 INTERCHANGEABLE
Resistor,variable,wire Wound,non
1220-00-275-8975 INTERCHANGEABLE
Computer
3020-00-351-8994SCB77463 INTERCHANGEABLE
Gear,drive Motion
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
2805-00-358-2939FA42 INTERCHANGEABLE
Tappet,engine Poppet Valve
Wisconsin Motors, Llc
5940-00-394-9071BBCU-4/0 INTERCHANGEABLE
Splice,conductor
Penn-Union Corp Div Penn-Union Corp
5136-00-517-5563 INTERCHANGEABLE
Tap,thread Cutting
5920-00-519-6927 INTERCHANGEABLE
Fuse Link,electrical
5325-00-576-55484219 INTERCHANGEABLE
Grommet,nonmetallic
Kirkhill, Inc. Dba Kirkhill Inc
5331-00-618-3386VBB822B INTERCHANGEABLE
O-Ring
Ashcroft Inc Dba Heise
5315-00-680-3134 INTERCHANGEABLE
Pin,spring
Cross-Reference Index
Part NumberManufacturer
770-2 3-4 Mercury Products Corp (USA)
4-219-1 Dresser Industries Inc Leroi Div (USA)
4-219 Dresser Industries Inc Leroi Div (USA)
11008 Gleason Corp Anthes Div (USA)
770-2-75 Mercury Products Corp (USA)
S21015 PRIMARY H20 Tank Inc U S Motors Div (USA)
Related Parts
5905-00-158-5445INTERCHANGEABLE
RESISTOR,VARIABLE,WIRE WOUND,NON
1220-00-275-8975INTERCHANGEABLE
COMPUTER
3020-00-351-8994INTERCHANGEABLE
GEAR,DRIVE MOTION
SCB77463
2805-00-358-2939INTERCHANGEABLE
TAPPET,ENGINE POPPET VALVE
FA42
5940-00-394-9071INTERCHANGEABLE
SPLICE,CONDUCTOR
BBCU-4/0
5136-00-517-5563INTERCHANGEABLE
TAP,THREAD CUTTING
5920-00-519-6927INTERCHANGEABLE
FUSE LINK,ELECTRICAL
5325-00-576-5548INTERCHANGEABLE
GROMMET,NONMETALLIC
4219
5331-00-618-3386INTERCHANGEABLE
O-RING
VBB822B
5315-00-680-3134INTERCHANGEABLE
PIN,SPRING
4730-00-720-1868INTERCHANGEABLE
COUPLING HALF,QUICK DISCONNECT
1560-00-771-8211INTERCHANGEABLE
PULLEY,STABILIZER S
11008-00

Frequently Asked Questions

What is NSN 2990-00-309-9574?

NSN 2990-00-309-9574 is a Cap Assembly,protective,muffler-, manufactured by H20 Tank Inc U S Motors Div, classified under FSC 2990 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 2990-00-309-9574?

NSN 2990-00-309-9574 has 6 cross-referenced part numbers: 770-2 3-4 (Mercury Products Corp), 4-219-1 (Dresser Industries Inc Leroi Div), 4-219 (Dresser Industries Inc Leroi Div), 11008 (Gleason Corp Anthes Div), 770-2-75 (Mercury Products Corp) and 1 more.

What NSN replaces 2990-00-309-9574?

There are 12 known substitutes for 2990-00-309-9574: 5905-00-158-5445, 1220-00-275-8975, 3020-00-351-8994 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of S21015?

Key specifications for S21015: End Item Identification: 3805-00-727-6719; Material: STEEL; Pipe Outside Diameter Accommodated: 2.750 INCHES IN. 3 total characteristics are documented in the Federal Logistics Information System.

Is NSN 2990-00-309-9574 still in active supply?

NSN 2990-00-309-9574 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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