EN 541.3 Plastic Fluid Level Sight Glasses Prismatic, with Recessed Seal


ELESA original design
code: HFTR.PR

Product description


EN 541.3 prismatic fluid level sight glasses are practically indestructible. Therefore, they are designed to be relatively thin.

These crystal-clear fluid level sight glasses are fitted with a window creating a prismatic effect of a “cat’s eye“ to provide a clearer and unmistakable oil level reading irrespective of oil color or viscosity. The advantage of this effect becomes obvious in cases such as underfilling or overfilling and monitoring the situation under unfavorable conditions.

Fluid level sight glasses EN 541.3 can also be used in tanks which are pressurized. Test results are available.

Assembly instruction:
For mounting on walls of less than 4 mm thickness please use a fixing nut GN 543.1.


  • Crystal-clear Polyamid (PA 6-T)
  • Aging resistant
  • High mechanical strength
  • Temperature resistant up to 212° F (100° C)
  • Solvent resistant,
    but not suitable for alcohol

Seal rubber NBR (Perbunan)

RoHS compliant


Fixing nuts GN 543.1

Technical drawing

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EN 541.3 Plastic-Prismatic Fluid Level Sight Glasses, with Recessed Seal sketch

Part Options / Table

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Dimensions in: Inch (change to Metric)
Window glass
tightening torque
in Nm
0.59G 1/21.100.410.350.94 8 ... 10
0.79G 3/41.380.410.411.2610 ... 12
0.94G 11.670.430.531.5010 ... 12
1.20G 11/42.050.750.631.6112 ... 14

Build & Price

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Window glass d1
Thread d2

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Total US Dollars (net)
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≥ 500$3.49
Prop 65: -
Please contact our Sales Department for more information: 800-877-8351
RoHS: -
This part is new in our product range, no details are available at this time. For more recent details on the RoHS compatibility, please contact our Sales Department!
Weight: 0.010 lbs
If weight is not listed, please contact our Sales Department for additional information regarding weight.
Phone: 800-877-8351
All Prices are in US Dollars. Taxes Not Included.

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