General description This 2 Packs Toilet Tank to Bowl Coupling Kit (AS738756-0070A) is designed for 3-inch gasket most flush valve opening tanks. It includes all necessary components to ensure a solid attachment between the toilet tank and bowl, preventing leaks effectively. Technical specifications Includes: 3 green washers, 1 white washer, 1 black ring, long toilet tank bolts, hexagonal nuts, and black locking rings Gasket inner diameter: 3 inches Material: NBR (Nitrile Butadiene Rubber) Measurement allowed error: +/- 1-3 cm Compatibility and accessories Compatible with 2-piece toilets and other toilets with 3-inch flush valve opening tanks Installation Easy installation with included parts and hardware No need to replace the entire toilet Usage Provides a reliable and leak-free solution for toilet repairs Long-lasting rubber gasket material is easy to clean Other information Note: Light reflection and different displays may cause the color of the item in the picture to differ