If you work with industrial hoses on a regular basis, one of the most important components you could invest in is a coupler. They help connect hoses to various systems for optimal performance. If you're in the market for some, remember this advice.  Make Sure Design is Durable To really get your money's worth out of this investment, make sure the hose coupler's design is durable. Otherwise, the couplers won't last that long and you'll have to buy replacements more often than not.