This Rola-Chem Vertical Mount Pitot-tube Flowmeter can easily be mounted to a vertical pipe. Each unit is complete with instructions and stainless clamps. These instruments are calibrated to give actual flow as a visual indication. Both sides of the flowmeter are calibrated in gallons and liters per minute. This vertical mount flowmeter is designed to deliver accurate flow rates at a minimal cost. Fits 4" PVC pipe. Vertical mount. Range: 175 to 500 GPM.