Please note: There may be a slight color difference due to lighting and display settings, which does not affect the use. Thank you for your understanding. 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 thru components. Designed for 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 prevent leaks. High Quality Replacement: Made from high-quality, durable rubber material, manufactured to strict quality control standards that meet or exceed OEM specifications. Easy to Install: Drop-in replacement for spa heater union gasket. Simple installation saves time. Ideal for heater to pump connections, ensuring a secure, leak-free seal. Material: Rubber Color: As shown Package Contents: 6 x Spa Hot Tub Heater Gasket Note: Light reflection and different displays may cause slight color variations. Measurement allowance is +/- 1-3 cm. Only the above package content is included.