Product Description 40 mm (1-5/8") ID (inside diameter) green kink-free (spiral) tubing. Provides a better fit on dark grey 1-1/2" barbed PVC fittings (the ones most hardware stores sell) than 1-1/2" diameter tubing. Product Features 100 ft. coil Additional Information Select the correct tubing size based on your pump's maximum flow rate. These are guidelines only. Also consult the friction loss chart at the bottom of this page when selecting the proper tubing diameter for your application. Maximum Pump Flow Rate (GPH) Required Tubing Diameter 300 1/2" 720 3/4" 1,200 1" 2,000 1-1/4" 3,000 1-1/2" 4,800 2" 9,000 3" 12,000 4" The friction loss chart below shows the head loss in inches for each 10 feet of tubing. To keep the friction loss to a minimum and the flow rate up, select larger diameter tubing.
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