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Automann · Probes & Sensors
575.1055.1
In stock · ships from Knoxville
This is a sight glass designed for the coolant reservoir (surge tank) on Mack heavy-duty trucks.
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Replaces Mack OEM sight glass part numbers 20QS238, 21430050, 25153549, 20QS240, among others. Verify your reservoir has this sight glass style.
Part data verified against 4 catalog sources
Numbers this part supersedes or interchanges with. Showing 9 of 9.
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It allows you to visually inspect the coolant level without removing the cap, helping to prevent overheating and engine damage. You typically replace it when the lens becomes cracked, cloudy, or begins to leak, which can cause coolant loss or inaccurate level readings. This aftermarket part from Automann directly replaces several Mack OEM sight glass part numbers, ensuring a proper fit and function.
Part Number: 575.1055.1
MACK SIGHT GLASS
Dealer: Knox Trailers
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