Wema’s most versatile senders are the SSS/SSL, S3U, and S5U models. These single stainless-steel senders typically have an NBR (Nitrile Butadiene Rubber) float anddiffer only in their mounting methods.
SSS/SSL has a basic SAE 5-hole pattern, and typically mounts with gasket and screws; S3U has a 1.25″ BSP threaded mount; S5U has a 1.5″ NPT threaded mount.
These single stainless-steel models can be used in water, gasoline, hydraulic oil, or diesel.

SSS and SSL sensors have a float which rises and falls on the central shaft with the level of liquid in the tank.
These sensors are fully insulated to protect against dangerous electric currents inside the tanks.
This is an extremely important safety feature, because it protects against electrolytic corrosion as well as the danger of an explosion when used with gasoline.

For use with diesel, gasoline or water
Available in 1/2″ increments up to 19″; available in 1″ increments from 19″ to 60″
Can be used with any Wema System dash gauge
Sensor electrical resistance range is 240-33 Ohms (Standard Aftermarket)
All 316 stainless steel
Very easy to install
Includes gasket, but no mounting hardware (mounting bolts come with the required Under Ring Adapter)
Long term reliability under severe conditions
Integral mounted flange with standard American SAE 5-hole pattern
Fisheries stocks most incremental lengths (inches); odd lengths can be special ordered.

The Nitrile gasket should be changed every time the sending unit is changed.