When your flow switch is defective it is important that you must find a replacement fast to prevent your heater from meltdown. We also sell flow switches parts and kits for spa or hot tub. PST Pool Supplies sells products from top brands including Sundance, Jacuzzi, & more. For more information on products, discounts, or FREE shipping on Contiguous U.S. orders. Call us today at 866-535-0899.