When I’ve made temporary repairs on exposed, low-pressure drainpipes such as those used for washing machines or swimming pools, I’ve found automotive radiator hose to be quite useful. Radiator hoses are available in several diameters, and they come in a variety of offset shapes that can fit many situations. Best of all, these hoses are manufactured to withstand high pressures and temperatures, so it is unlikely that any home applications will exceed their capabilities.
To repair a drainpipe, I remove the damaged portion and file smooth any burrs. Then I slip radiator hose over both ends of the pipe, and cinch them with a hose clamp. This allows me to repair broken lines with ease.
Greg Clarke, Mountain View, CA