This Rola-Chem Side Mount Pitot-tube Flowmeter can easily be mounted to a horizontal 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 side mount flowmeter is designed to deliver accurate flow rates at a minimal cost. Fits 2" PVC pipe. Top mount.