Ozone Injector, Mazzei, 3/4", Red. For over 42 years, Hydro Quip has been a trusted leader in innovative, high quality, and reliable portable spa and hot tub retrofit controls. We offer the industry's most extensive selection of controls and replacement parts, ensuring the perfect fit for any spa or hot tub. Driven by innovation and real‑world functionality, we design products that meet the evolving needs of spa and hot tub retailers and service technicians.