GN 537 Fluid Level Sight Glasses Aluminum, with Limit Indicator


Product description


No thread is required for installing the GN 537 fluid level sight glasses.

The fluid level sight glass is inserted into the bore d2, tolerance H11. By simply tightening the ring nut using the pin key, the seal is pressed against the contact surface which, at the same time, holds the sight glass in position.

For removal, reverse the procedure.

Application is limited to non-pressurized or slightly pressurized tanks.


Sight glass body
  • Aluminum

Sight glass
  • Plexiglas (PMMA)
  • temperature resistant up to 176° F (80° C)

  • NBR synthetic rubber

  • White plastic with red fluid level limit indicators

  • Push-fit; use pin key for installation

RoHS compliant


GN 537.1 Pin key

On request

Pin key for installation GN 537.1
(see table)

Technical drawing

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GN 537 Aluminum Fluid Level Sight Glasses, with Limit Indicator sketch

Part Options / Table


Awithout max. / min. oil level marks
Bwith max. / min. oil level marks
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Dimensions in: Inch (change to Metric)
Window glass
d3d4hl1l2Code no.
Pin key
for installation

Build & Price

Window glass d1
Push-fit diameter d2

Selected Part

Total USD (net)
In stock: 15
In stock
Please note our quantity discounts (USD).
≥ 250$9.47
Weight: 0.017 lbs
If weight is not listed, please contact our Sales Department for additional information regarding weight.
Phone: 800-877-8351
RoHS compliant: Yes
This article conforms to RoHS, which means it complies with EU Directive 2011/65/EU for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances)).
All Prices are in US Dollars. Taxes Not Included.

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