Fit for Hot Tub Parts: The o-ring 711-4030B 2-inch spa hot tub heater gasket is compatible with 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). Compatible with most spa pump or heater unions, suitable for 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 spa pumps, hot tubs, or heater joints to help prevent leaks. High Quality Replacement: This 2-inch spa hot tub heater gasket is made from high-quality, durable rubber material and manufactured to strict quality control standards, meeting or exceeding original part specifications. Easy to Install: A drop-in replacement for spa heater union gaskets, designed for simple installation and reliable sealing performance. Ideal for heater to pump connections, providing a secure seal to help prevent leaks. Please Note: Slight variations in color due to lighting or display settings may occur. This does not affect functionality. Color: As shown in photo Material: Rubber Package Contents: 4 x Spa Hot Tub Heater Gasket Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual item. Measurement may vary by +/- 1-3 cm.