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Full Vision Flow Sights with Pyrex (glass) sights are suitable for temperatures up to 225° F and withstand a maximum pressure of up to 30 PSI. They are used in oil lines to allow visual observation of the flow and clarity of oil. The large size of the flow sight permits maximum visibility of the oil, even from a distance. They are often used at elevated heights to tell at a glance whether oil is circulating. The valves are tamperproof and dispense liquid at a specific flow rate.