The body HCZ-AR is in transparent polyamide based (PA-T/AR) technopolymer. Highly resistant to shocks, solvents, oils with additives, aliphatic and aromatic hydrocarbons, petrol, naphtha, phosphoric esters, additives and detergents containing alcohol. High UV resistance. The screws, nuts and washers is in zinc-plated steel. The packing rings is in step-shaped for the seal on the reservoir walls and NBR synthetic rubber O-ring screw underhead. Suggested roughness of the packing ring application surface Ra = 3 µm. The contrast screen is in white lacquered aluminium. The housing, in the appropriate external rear slot, guarantees the best protection from direct contact with fluid. It can be taken out from the inclined side, before assembly to allow the insertion of level lines or words.