This is a remodelled version of the S.T.F flowmeter with an air chamber provided between the joint and the indicator of the flowmeter. It is designed to measure slurry liquids in particular, without allowing sand, soil or dust in the liquid to enter the indicator. Please specify the diameter from the range of 1/2B - 8B. Please specify the body material from SS41, SUS304, SUS316, P.V.C. Please specify the main parts materials from SUS304, SUS316, SUS316L or P.V.C. Please specify the lining of parts in contact with liquid from the following: Rubber, Epoxy resin or P.V.C.