Usage Tips:Fit for Hot Tub Parts:The o-ring 711-4030B 2inch spa hot tub heater gasket Replace for Gecko, for Hydro Quip, for Aeware, for United, and most other Flow Thu 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,fit for Arctic Spa, for Self Flowing Spa, for Beachcomber Spa, for Bullfrog Spa, for Volcano Spa, for California Spa, for Canadian Spa Company, for Filber Spa, for Coleman Spa, for Catalina Spa, for Jacuzzi, for Hot Spring Spa, for Marquis Spa, for Sweet Water Spa, for Thermopa Spa, for Unicel Spa, for Viking Spa Vita Spa, for Waterway Spa, most spa pumps, spa hot tubs or heater joints to prevent leaks. for Balboa replacement parts: Our replace for Balboa 2inch 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 spa heater union gasket, it's easy to install and saves you valuable time. hot tub heater gaskets usually for a heater to pump connection,Perfectly sealed the leak in the spa. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour: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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.