Your cart is empty
Browse our catalog to find the parts you need.
These images are illustrative and may not match the product exactly. Always verify by part number — or confirm instantly with the assistant using a photo or VIN.

Dixon · Probes & Sensors
5201-SFI
In stock · ships from Knoxville
The Dixon 5201-SFI is a 4-inch TTMA flanged sight flow indicator made of durable cast aluminum with a Baylast™ O-ring seal.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 3 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Other applications
Other applications
Requires a 4" TTMA flange connection. Not compatible with crude oil (can degrade the seal). Maximum flange bolt torque is 200 in-lb.
Part data verified against 5 catalog sources
Different year, make, or config? Get a confirmation against your truck in under a minute.
It mounts between tank truck flanged butterfly valves, giving you a clear visual window to check the fuel grade (gasoline, diesel, up to E100 and B100 biofuels) before opening the valve. This indicator is used on fuel delivery tank trailers, crude trailers, and gas trailers to help prevent cross-contamination and to confirm proper liquid flow. You would replace it if the sight glass is cracked, the seal leaks, or the aluminum housing shows corrosion.
Part Number: 5201-SFI
4 SIGHT FLOW INDICATOR
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more