FL-2 Tank Fitting Flange - Wema UK
FL-2 Tank Fitting Flange - Wema UK
FL-2 Tank Fitting Flange - Wema UK
FL-2 Tank Fitting Flange - Wema UK
FL-2 Tank Fitting Flange - Wema UK
FL-2 Tank Fitting Flange - Wema UK


FL-2 Tank Fitting Flange

2 reviews
Regular price£3.99
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I recommend this product

great super fast delivery

Easy website & quick delivery!

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I recommend this product

Senders & Overall Service

I'm so pleased I chose Wema senders for my motorhome project level senders, I had already purchased a set of cheaper senders that frankly I wasn't confident would last, So I opted to purchase the S3 senders in a number of lengths. Ordering and delivery was military efficient and super fast, and the overall build quality of the components is exceptional in every aspect, robust yet sensitive, 316 Stainless steel rather than frankly what looked like welding rods on the cheap rubbish! Very impressed all round and now have confidence that after a winter stood with either empty or full tanks they will still work as well as they do today.

John C.
United Kingdom United Kingdom


    Wema FL-2 Tank Fitting Flange is used for mounting the S3 fuel or water sender or S3H holding tank (black water) sender.

    Fitted to topside of tank to create 1 ¼" BSP thread.  Hole pattern is standard SAE 5 hole

    Can be used with VDO-U inner ring.


    For mounting in tanks with a thin top it is recommended to use a FL-2 tank fitting flange together with a FLS-U under-ring (stainless steel) flange to secure against leaks.

    The hole pattern on the FLS-U fits the 5 inner holes on the FL-2.

    This hole pattern is the standard SAE 5-hole pattern Ø54 mm.

    Please note that the SAE 5-hole pattern is not symmetrical.

    Turn the parts to find the correct position before fitting the screws. A mark on both parts shows corresponding holes.



      • 1 ¼" BSP thread and dual 5 hole pattern
      • Converts SAE 5 hole or VDO 5 hole pattern for retro-fitting
      • Supplied with Nitrile rubber gasket
      • Screw hole size - 5mm
      • Supplied with nitrile gasket 
      • Set of small headed M5 stainless screws available as extra item for use with inner hole pattern.
      • Perfect for use in retrofitting floating arm sender to give female thread for standard S3 type Wema sender



    When mounting the FL-2, cut a 59 mm hole in the tank where the sensor is to be placed.

    Slide the FL-U or FLS-U in place inside the tank, and mount the FL-2 with rubber gasket on tank top.

    When all 5 screws are securely tightened, the S3 sensor, with its 2 o-rings, can be screwed into the FL-2 flange.

    To supply a replacement fuel or water sender we just need to know:


    • What is the Wema product code?

    If your sender has information stamped on the head then we can identify your sender from the product code:

     Identifying a Wema sender

    [Please note: the code 001300 refers to the S3 head and the code 001306 / 001305 refers to the S5 sender head]


    Do you have an S3 or S5 sender?

    The S3 has a screw in head with a 1.25" BSP thread like this:

    [NOTE: A 1.25" BSP (British Standard Pipe) thread will actually measure larger than 1.25 inches when measured with a tape measure.  This is because a BSP measurement refers to the internal bore of a pipe (for accurate flow rate) and not the outside of the thread.] 

    Wema S3 sender head

    The S5 has a bolt down head with 5 holes like this:

    Wema S5 sender head


    [NOTE: The 5-hole drill pattern in the top of an S5 sender head is a standard SAE-5-hole pattern.] 


    If you have a sender that is not an S3 or S5 then please click here


    What resistance is your current sender and gauge?

    The sender and gauge must have the same resistance values or the gauge will read incorrectly.

    You can either test the gauge or the sender to find this out.


    To test the sender:

    • Disconnect the two wires on top of the sender.

    • Remove the sender from the tank.

    • Connect the wires on the sender to a multimeter. 

    • Set the multimeter to resistance [Ω ohms]

      How to test a sender - Wema

    • Move the float to the top of the sender and take a reading on the multimeter:

      • At the top of the sender (full) the resistance should be:

        • European specification - 190 ohms

        • American specification - 30 ohms

    • Move the float to the bottom of the sender and take a second reading:

      • At the bottom of the sender (empty) the resistance should be:

        • European specification - 0 ohms

        • American specification - 240 ohms 

    To test the gauge:

     If you have access to the wires on the back of the gauge;

    • Power the gauge off

    • Disconnect the black wire (sender) 

    • Power the gauge on

    • If it's an American gauge the needle will show EMPTY

      • Touch the black wire to earth, the needle will go to FULL

    • If it's a European gauge the needle will show FULL

      • Touch the black wire to earth, the needle will go to EMPTY

    If you don't have access to the back of the gauge;

    • Disconnect the two wires in the loom that attach to the sender.

      • If it's an American gauge the needle will show EMPTY

      • If it's a European gauge the needle will show FULL


    To measure an S3 or S3H sender (with screw in head) measure from the top of the thread to the bottom of the stem.

    How to measure Wema S3 sender

    To measure an S5 sender (with bolt down head) measure from the underside of the flange to the bottom of the stem

     How to measure Wema S5 sender


    How many wires?

    If your S5 or S3 sender has 2 wires then it is a standard resistance sender.

    If your S5 or S3 sender has 3 or 4 wires then it is either a 0-5v, 0-10v sender or it has a high/low level alarm.

    If you have a 3 or 4 wire sender then please contact us before ordering.

    If your sender has a high or low level alarm we will need to know if the switch is normally off (when the tank is empty), turning on when the tank is full or normally on, turning off when the tank is full.  We will also need to know how far from the top or bottom of the sender you would like the alarm switch to be.


    Tank Contents?

    For fuel or water then you can fit the maximum length of sender for your tank.

    For a black water holding tank we recommend leaving at least 50mm from the bottom of the tank regardless of the material the tank is made from.

    If you tank does not contain fuel, fresh water, grey water or black water then please contact us for more specific information.  For very thick liquids like oil or grease we may need to know the viscosity.


    Wema Sender Identification Chart 
        (click here for larger view)

    Wema Sender Identification Chart 


    NMEA2000 Products