Fit for Hot Tub Parts: The o-ring 711-4030B 2-inch spa hot tub heater gasket replaces Gecko, Hydro Quip, Aeware, United, and most other flow-through components. Designed for a 2-inch pipeline (actual measured gasket size is approximately 3 inches), it is compatible with most spa pump or heater unions. 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, and most standard spa pumps, hot tubs, or heater joints to prevent leaks. High Quality Replacement: This 2-inch spa hot tub heater gasket is made from high-quality rubber material, built to strict quality control standards, ensuring reliable performance and durability. Meets or exceeds original part specifications. Easy to Install: Direct drop-in replacement for spa heater union gaskets. Simple installation saves time and effort. Ideal for heater-to-pump connections, providing a secure seal to prevent leaks. Color: As shown in photo Material: Rubber Package Contents: 4 x Spa Hot Tub Heater Gasket (other items not included) Note: Slight color variations may occur due to lighting and display differences. These do not affect functionality. Measurement allowance is +/- 1-3 cm.