Suction Hose is the thick hose we use to pull fluid or fuel from a tank into the pump. It has a smooth inner lining and is reinforced with steel wire so it won’t collapse under vacuum. We clamp it tightly at the tank and pump inlets so no air leaks in, or the pump will suck air and stop working. When it cracks or gets soft, we swap it quickly. It’s like the straw that drinks up the fluid, no straw, no sip.