TRV4 Classic chrome/white control knob with chrome plated brass body that can be fitted on the flow or return with sensing head in either a vertical or horizontal position. Liquid filled sensor with frost protection and range limiting. ½" BSP TM radiator tailpiece. TRV4 approved to EN 215. Lockshield valve (L/S) approved to BS 2767-10.NOTE: the TRV4 sensor head IS NOT suitable for use with the TRV3 body.
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