Impulse Tubes are the piping (or tube) connection between a differential pressure gauge (or transmitter) and a differential head flow element (office plate, venturi tube pitot tube etc. One impulse pipe will connect between the total pressure tap on the flow element and the thigh side of the differential pressure gaugertransmater. The other impulse pipe vall connect between the static pressure tap on the flow element and the love side of the deferential pressure gaugeffransnitter. A differential gauge or transmtler measures dynamic presser, the measured pressure difference between the two impulse pipes, We provide Seamless 55316 Impulse Tubes in different sizes.