This plumbing adapter features a small female thread on one end and a larger male thread on the other. Pump operators use it to connect a smaller diameter hose line into a larger discharge port or supply line. It allows water to flow from a restricted opening into a wider channel, though it does not increase the actual water pressure.
Heard on the job
Thread an increaser onto the inch-and-a-half discharge so we can hook up the two-and-a-half inch supply line.