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685-68999 — PARTS KIT,SAFETY RELIEF VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

685-68999: PARTS KIT,SAFETY RELIEF VALVE.

The PARTS KIT,SAFETY RELIEF VALVE is a the manufacturer industrial component. Key specifications include supply_items_and_quantities: O-RING 2; LOCKNUT 1; PISTON 1; SEAT 1; STEM 1; BACK-UP 1. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-132-4899, 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
685-68999
NSN: 4820-01-132-4899
FSC: 4820 — Valves, Nonpowered
CAGE: 55683 — WHEELER FLEET SOLUTIONS, CO. (USA)
SPECIFICATIONS
component_quantity7
supply_items_and_quantitiesO-RING 2; LOCKNUT 1; PISTON 1; SEAT 1; STEM 1; BACK-UP 1
NSN4820-01-132-4899
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 685-68999 · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
COMPONENT QUANTITY: 7
•
SUPPLY ITEMS AND QUANTITIES: O-RING 2; LOCKNUT 1; PISTON 1; SEAT 1; STEM 1; BACK-UP 1
TECHNICAL CHARACTERISTICS
COMPONENT QUANTITY7
SUPPLY ITEMS AND QUANTITIESO-RING 2; LOCKNUT 1; PISTON 1; SEAT 1; STEM 1; BACK-UP 1
SUBSTITUTES & CROSS-REFERENCES 1
68999Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 685-68999?
685-68999 is a PARTS KIT,SAFETY RELIEF VALVE.
What parts can replace 685-68999?
There is 1 known substitute for 685-68999: 68999. Substitute compatibility should be verified for your specific system.
What is the NSN for 685-68999?
685-68999 is cataloged in the U.S. Government catalog under NSN 4820-01-132-4899. 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.