Does this still allow the drum to vent? And has anyone use this on the B side of closed cell foam(polyol resin)?

Not really which is kinda stupid. We use it for our oil drums and always have issues with venting, eventually we just removed it because it was more trouble then it’s worth.

is the gauge water tight to be installed in the utside ? I would hate to get condensation and not be able to read it....

No It is not water tight. Not for outdoor use.

do you have a version that will fit on the 2'' port

Check your 2” port cap, some of them have a 3/4” threaded hole in the middle. You’ll have to punch out or cut the hole, but this fit perfectly in mine. Note, I did buy and install a short 3/4” riser to allow the gauge to screw on snuggly onto the 2” cap.

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Groz 55-Gallon Drum Level Indicator, 3/4" NPT Bung Mount with Planetary Gear Float and Air Release Venturi, 0-55 Gallon Scale for Oil, Fuel, Coolant and Water Drums (48003)

Groz 55-Gallon Drum Level Indicator, 3/4" NPT Bung Mount with Planetary Gear Float and Air Release Venturi, 0-55 Gallon Scale for Oil, Fuel, Coolant and Water Drums (48003)

Product ID: 129625461

Details

Brand
Groz
Item Weight
150 Grams
Item dimensions L x W x H
9.45 x 1.97 x
Material
Polyethylene
Number of Items
1

🔧3/4" NPT bung mount

⚙️Planetary gear precision

🛢️0-55 gallon scale

Description

🛢️ Know your drum’s story at a glance—stay ahead, stay stocked!

SPACE SAVING DESIGN - Mounts on 3/4" bung, leaving the 2" bung free for pumps and easy access.
INSTANT FLUID INSIGHT - Get real-time drum levels without lifting a lid—never run dry again.
VERSATILE INDUSTRIAL USE - Perfect for automotive shops, fleet maintenance, manufacturing, and agriculture.
DURABLE POLYETHYLENE BUILD - Engineered to withstand harsh industrial environments and diverse fluids.
UNIVERSAL FLUID COMPATIBILITY - Adjustable float buoyancy for oils, fuels, coolants, and water-based liquids.

The Groz 55-Gallon Drum Level Indicator is a rugged polyethylene gauge that mounts on a 3/4" NPT bung to provide an easy-to-read 0-55 gallon analog scale. Featuring a planetary gear-driven dial and an adjustable water-filled float, it accurately indicates fluid levels across oils, fuels, coolants, and water-based liquids. Its design frees the main 2" bung for pumps, making it ideal for industrial, automotive, and agricultural settings where timely fluid monitoring prevents downtime.

Specifications

ASIN	B077WRMPMP
Best Sellers Rank	#138,571 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #56 in Liquid Level Sensors
Brand Name	Groz
Customer Reviews	3.6 3.6 out of 5 stars (101)
Global Trade Identification Number	08901486480015
Included Components	Drum Level Indicator
Item Dimensions	9.45 x 1.97 x 1.77 inches
Item Type Name	Groz 48001 Drum Oil Level Indicator
Item Weight	150 Grams
Manufacturer	Groz
Material Type	Polyethylene
Model	48003
Part Number	48001
Thread Style	Npt
Unit Count	1.0 Count

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