Please note: There may be a slight color difference due to lighting and display variations, which does not affect usability. Thank you for your understanding.Compatible with Hot Tub Parts: This 2-inch o-ring gasket (actual measured gasket size is approximately 3 inches) replaces model 711-4030B and is designed for spa hot tub heater unions. Fits Gecko, Hydro Quip, Aeware, United, and most other flow-through components for 2-inch pipelines.Universal Fit: Compatible with most spa pump and heater union gaskets. 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 other common spa brands. Ideal for sealing pump-to-heater connections and preventing leaks in hot tubs and spa systems.High Quality Replacement: Made from durable rubber material, this Balboa 2-inch spa heater gasket meets or exceeds OEM specifications. Built to strict quality standards for long-lasting performance in demanding spa environments.Easy Installation: Designed as a direct drop-in replacement for spa heater union gaskets. Simple to install, requires no special tools, and helps create a secure, leak-free seal between the heater and pump.Material: Rubber Color: As shown Package Includes: 6 x Spa Hot Tub Heater Gasket Note: The package includes only the items listed above. Measurement tolerance is +/- 1-3 cm.