The TF Series is a multi-function true union paddlewheel flow meter. The TF Series Paddlewheel Flow Meter provides high accuracy economically while ideal for thermoplastic piping systems. The TF Series consists of a rugged true union industrial design that is suitable for corrosive applications while providing a 1 amp selectable output relay that can be used as an alarm for high or low flow rate conditions. Sizes 1/2 in. to 2 in. and flanged 3 in. to 4 in.