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3999756 — FILLER NECK,LIQUID HOLDING UNIT

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

3999756: FILLER NECK,LIQUID HOLDING UNIT.

FILLER NECK,LIQUID HOLDING UNIT. Key specifications include overall_length: 4.5 INCHES NOMINAL IN, special_features: WEIGHT 1.57 POUNDS;HEIGHT 0.3 INCHES;WIDTH-3.5 INCHES LBS, part_name_assigned_by_controlling_agency: FILLING CONNECTION. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-726-2297, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
3999756
NSN: 5340-01-726-2297
FSC: 5340 — Hardware, Commercial
CAGE: 15434 — CUMMINS INC. (USA)
SPECIFICATIONS
overall_length4.5 INCHES NOMINAL IN
special_featuresWEIGHT 1.57 POUNDS;HEIGHT 0.3 INCHES;WIDTH-3.5 INCHES LBS
part_name_assigned_by_controlling_agencyFILLING CONNECTION
NSN5340-01-726-2297
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3999756 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
TECHNICAL CHARACTERISTICS
OVERALL LENGTH4.5 INCHES NOMINAL IN
SPECIAL FEATURESWEIGHT 1.57 POUNDS;HEIGHT 0.3 INCHES;WIDTH-3.5 INCHES LBS
PART NAME ASSIGNED BY CONTROLLING AGENCYFILLING CONNECTION
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3999756?
3999756 is a FILLER NECK,LIQUID HOLDING UNIT.
What is the NSN for 3999756?
3999756 is cataloged in the U.S. Government catalog under NSN 5340-01-726-2297. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.