Fit for Hot Tub Parts: The o-ring 711-4030B 2 inch spa hot tub heater gasket replaces for Gecko, Hydro Quip, Aeware, United, and most other flow through components. For a 2 inch pipeline (the actual measured value of the gasket is 3 inches). Compatible with most spa pump or heater unions gasket. Fits Arctic Spa, Self Flowing Spa, Beachcomber Spa, Bullfrog Spa, Volcano Spa, California Spa, Canadian Spa Company, Filber Spa, Coleman Spa, Catalina Spa, Jacuzzi, Hot Spring Spa, Marquis Spa, Sweet Water Spa, Thermopa Spa, Unicel Spa, Viking Spa Vita Spa, Waterway Spa, most spa pumps, spa hot tubs, or heater joints to prevent leaks. High Quality for Balboa replacement parts: Our replacement for Balboa 2 inch spa hot tub heater gasket is made from high-quality, durable materials and manufactured to strict quality control standards that meet or exceed part number specifications. Easy to Install: A drop-in replacement for spa heater union gasket, it's easy to install and saves you valuable time. Hot tub heater gaskets are usually used for heater to pump connection, perfectly sealing the leak in the spa. Please note: there may be slight color differences due to lighting or display settings, which do not affect use. Color: Photo Color Material: Rubber Package Contents: 4 x Spa Hot Tub Heater Gasket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. The measurement allows an error of +/- 1-3 cm.