These connectors work to connect Tygon tubing to measuring devices, like digital flowcoms, pitot tubes, well type, slack tube, and digital hand held manometers. Will work with Tygon tubing sizes 3/32″ID, 1/8″ID (15) piece set of 1/8″ plastic barbed that include (5) tees, (5) 90 degree elbows, and (5) wye connectors.