A drag indicator displays the pressure so that a pressure drop in the system can be easily determined Reliable and precise measurement results: the dual valve system (twin valve) allows self-testing of the pump, as well as a precise fine adjustment of the pressure Especially accurate measurement if necessary: finely scaled (scaling 0.1 bar) pressure gauge optionally available Testing hose with steel mesh prevents measuring errors caused by expansion of the hose during operation Type 50-S: Weather and cold-resistant steel container with DURAMANT coating Type 50-S stainless steel: high-quality corrosion-resistant stainless steel container