Hose for Bilge Pumps
While no standard exists for bilge-pump hoses per se, there are a few guidelines to keep in mind. For one thing, make sure that its diameter is equal to the output of the bilge pump. If it's smaller, it will severely diminish the pump's output. The hose run should be as short and as straight as it can be. Hose length and hose bends both add tremendous resistance to a plumbing system. Avoid corrugated hose. While corrugated hose is simple to install because it's simple to bend, the ridges can trap the debris that inevitably collects in a bilge. Make sure that the hose material can stand up to anything that might end up in the bilge. Never forget that bilges are by definition nasty places. Fluids that you never planned for — engine coolant, say, or hot water, or worse — might very well end up in the bilge someday, so choose a hose with a heavy-duty, reinforced construction. The bilge-pump hose needs to be able to carry whatever comes along.