Originator of the Bull's Eye Sight Flow Indicator
Jacoby-Tarbox has been manufacturing sight flow indicators and sight windows for industrial pipelines since 1904. Their bull's eye indicator — the original design they invented — remains the industry standard for visual flow verification, available in threaded NPT, ANSI flanged, high-pressure, Teflon-lined, sanitary, and FM-approved configurations.
Northeast Controls represents decades of experience with the complete Jacoby-Tarbox line. Our team can help you select the right model for your pressure class, temperature rating, connection type, and chemical compatibility requirements — call us at 1-201-419-6111 or [email protected].
Pressure Ratings
150# Nominal to 3000 psi
Temperature Range
Up to 750°F (ASME rated)
Connection Types
NPT Threaded, ANSI Flanged, Tri-Clamp
Body Materials
Carbon Steel, 316 SS, Alloy Steel, Teflon-Lined
Standards
ASME B31.1, B31.3, 3-A Sanitary, FM Approved
In Service Since
1904
Why Jacoby-Tarbox
Originator of the Bull's Eye
Jacoby-Tarbox invented the bull's eye sight flow indicator. Every model in the line traces directly back to that original design — refined over 120+ years of industrial service.
ASME B31.1 & B31.3 Rated
Flanged models are built to full ASME B31.1 (power piping) and B31.3 (process piping) code. Available with full material traceability and third-party inspection.
Extreme Service Capability
High-pressure models rated to 3000 psi. High-temperature flanged models rated to 750°F. UniGlas® windows eliminate glass blowout risk in the most demanding conditions.
Corrosive & Sanitary Service
Teflon/PFA-lined models for aggressive chemical service. 3-A certified sanitary models with tri-clamp connections for food, dairy, beverage, and pharmaceutical applications.
Jacoby-Tarbox Product Finder
Find the right sight flow indicator or sight window.
What type of product do you need?
Sight Flow Indicators
Bull's eye, cylindrical, high-pressure, Teflon-lined, sanitary, and specialty models for every process condition.
NPT Bull's Eye — 150# Nominal
Standard threaded NPT bull's eye indicators, 150# nominal pressure rating. Most common general-service model.
NPT Bull's Eye — 150# ANSI
NPT threaded bull's eye indicators rated to ANSI 150# for higher-integrity installations.
NPT Bull's Eye — 3000# High Pressure
High-pressure threaded bull's eye indicators rated to 3000 psi for demanding process conditions.
Flanged Bull's Eye — 150# & 600#
Flanged bull's eye sight flow indicators in ANSI 150# and 600# ratings. Full ASME B31.1/B31.3 construction.
90° Bull's Eye — 150#
Right-angle bull's eye indicators for installations where straight-through piping isn't possible.
Teflon / PFA-Lined Sight Flow Indicators
PTFE and PFA-lined indicators for corrosive chemical service. Full chemical resistance with clear visual indication.
Sanitary Sight Flow Indicators (3-A)
3-A approved sanitary indicators for food, dairy, beverage, and pharmaceutical service. Tri-clamp connections.
FM Dual Windows
FM-approved dual sight windows that combine a sight flow indicator and sight window in a single body.
Specialty Models
Specialty sight flow indicator models including the 850-S, 830-F, and 4000-S for unique process requirements.
Sight Windows
Weld-pad, ASME code, UniGlas® safety, and FM-approved dual sight windows for vessel and pipe wall mounting.
Weld-Pad Sight Windows
Weld-pad sight windows for direct mounting to vessel walls and pipe sections. Multiple sizes and pressure ratings.
ASME Code Sight Windows (5200PVQ / 5300PVQ)
ASME Section VIII pressure vessel quality sight windows. Round (5200PVQ) and oblong (5300PVQ) models with full code documentation.
UniGlas® Safety Sight Windows
Fused glass-to-metal construction eliminates the risk of glass blowout. For high-pressure and high-temperature service.
FM Dual Sight Windows
FM-approved dual sight windows for hazardous location installations requiring visual process access.
Accessories & Lighting
Illuminate your sight flow indicators and process vessels with FM/ATEX-approved LED lighting.
Typical Applications
Jacoby-Tarbox Sales & Technical Support