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Technical Data Sheet
PartsTable / COMPONENT / B203-4
B203-4 ✓ 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 FILTER,INDICATOR LIGHT is a the manufacturer industrial component. Key specifications include color: GRAY/GREY, material: PLASTIC, overall_length: 22.370 INCHES MINIMUM AND 22.380 INCHES MAXIMUM IN, overall_diameter: 1.540 INCHES MINIMUM AND 1.550 INCHES MAXIMUM IN, style_designator: TUBULAR, polarization_feature: NOT INCLUDED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-241-9253, 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
B203-4
NSN: 4820-01-241-9253
FSC: 4820
CAGE: 28193 — HENRY TECHNOLOGIES, INC. (USA)
SPECIFICATIONS
colorGRAY/GREY
materialPLASTIC
overall_length22.370 INCHES MINIMUM AND 22.380 INCHES MAXIMUM IN
overall_diameter1.540 INCHES MINIMUM AND 1.550 INCHES MAXIMUM IN
special_featuresACRYLIC FILTER TUBE THAT FITS OVER F20T12/CW OR F17T12/CW LAMP WITH 1% TRANSMISSION; ANTI-STATIC COMPOUND, ANSTAC 2M ANTI-STATIC (G15) OR EQUAL TO FILTER TUBE AFTER ASSEMBLY OF LABEL
style_designatorTUBULAR
polarization_featureNOT INCLUDED
end_item_identificationGAGE LIQUID L; LOS ANGELES CLASS SSN (688)
specification/standard_data81349-MIL-F-16377/42/SUPERSEDED GOVERNMENT SPECIFICATION
part_name_assigned_by_controlling_agencyGRAY FILTER TUBE ASSEMBLY 20 WATT/NTPS-1.0
NSN4820-01-241-9253
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: B203-4 · 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 3
B-2034Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-16377/42Interchangeable
interchangeable cross-reference
interchangeable
M16377/42-007Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B203-4?
B203-4 is a FILTER,INDICATOR LIGHT.
What parts can replace B203-4?
There are 3 known substitutes for B203-4: B-2034, MIL-DTL-16377/42, M16377/42-007. Substitute compatibility should be verified for your specific system.
What is the NSN for B203-4?
B203-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-241-9253. 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