Shop equipment systems add-on kits for hot tubs and spas at Hot Tub Spa Supplies - one of the largest online dealers of replacement parts and accessories for spas and hot tubs.Take advantage of FREE SHIPPING on orders to the lower 48 states on orders over $299. Whether you are repairing your hot tub or spa, or doing routine maintenance - our customer service team is here to help you find the right replacement parts for your spa or hot tub. Call 914-237-5606 to speak with a customer service specialist.