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PartsTable / COMPONENT / 20777 ITEM 18
20777 ITEM 18 ✓ Verified by PartsTable
— · GATE VALVE
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

The VALVE,STOP-CHECK is a the manufacturer industrial component. Key specifications include color: BLACK CASE, material: RUBBER SYNTHETIC OVERALL, dial_size: 4-1/2 IN. DIA IN, bezel_type: HINGE, body_style: THREADED BUSHING MOUNTED, scale_name: PRESSURE.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-650-5375, 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
20777 ITEM 18
NSN: 4820-01-650-5375
FSC: 4820
CAGE: 95368 — AERCO INTERNATIONAL, INC. DBA AERCO INTERNATIONAL INC (USA)
SPECIFICATIONS
colorBLACK CASE
materialRUBBER SYNTHETIC OVERALL
dial_size4-1/2 IN. DIA IN
bezel_typeHINGE
body_styleTHREADED BUSHING MOUNTED
scale_namePRESSURE
scale_typeSINGLE
scale_range+0.0 TO 600.0 POUNDS PRESSURE PER SQUARE INCH LBS
pointer_typeINDICATING
thread_class2A A
adjustabilityADJUSTABLE
overall_depth2.188 INCHES NOMINAL IN
NSN4820-01-650-5375
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 20777 ITEM 18 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
AA446-PM-4RWXXInterchangeable
interchangeable cross-reference
interchangeable
176F33FInterchangeable
interchangeable cross-reference
interchangeable
AA34-6PM4-RWXXInterchangeable
interchangeable cross-reference
interchangeable
20777Interchangeable
interchangeable cross-reference
interchangeable
GH78261ITEM114Interchangeable
interchangeable cross-reference
interchangeable
2307900Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 20777 ITEM 18?
20777 ITEM 18 is a VALVE,STOP-CHECK.
What parts can replace 20777 ITEM 18?
There are 11 known substitutes for 20777 ITEM 18: AA446-PM-4RWXX, 176F33F, AA34-6PM4-RWXX and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 20777 ITEM 18?
20777 ITEM 18 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-650-5375. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026