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This 1.5" sight glass is an invaluable tool for monitoring water flow and potential system issues. I can now visually inspect water movement without dismantling any components, which saves me time and potential frustration. The glass is crystal clear and seems highly durable, showing no signs of cloudiness or scratching. Installation was straightforward, though I recommend having Teflon tape and a proper wrench for a secure fit. It's amazing how such a simple component can provide so much insight into my pool's hydraulic system. A must-have for detail-oriented pool owners.