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Reflex type level gauges sturdily consist of a body with glass and cover tightened by U-bolts. They have a prism glass window that uses the basic optical principles of light refraction and reflection to enhance the indication of the liquid level. They are suitable for various ranges of pressure lines; from low to high pressures, and made of carbon steel or stainless steel. In addition, they are lightweight structures and available for long visible lengths. What is more, Reflex types are available at low price. Reflex type level gauges are equipped with a ball check valve (emergency shut-off valve).