This is our mainstay hose for a boom pump. The boom is reduced at the last 90 from 5 to 4 and 4 to 3". We then use 4" discharge hose slipped over the 3" reducer and clamped without the gasket. You may have to warm the hose up on the exhaust of the pump in order to get it to slip over the 3" coupling. We cut this hose at about 12' and trim off the clamped end each time we use it. It will make for an easy placement job since the hose man can direct the concrete perfectly...eliminating any spills etc. This hose also can make a mediocre pump operator look good since the hose man can move it freely unlike the regular tip hoses that the pumps carry.