Shop spa heater unions - O-rings, gaskets, retainers, tail pieces and more for your hot tub or spa plumbing repair projects.If you need help finding the right parts for your model spa or hot tub, our customer service team is here to help. Call 914-237-5606 and let us help you find the right parts for your hot tub maintenance or repair. Always FREE SHIPPING on orders over $299 (when shipping to the lower 48 states).