The gasket is made of EPDM, which has excellent water resistance and sealing performance, and is not easy to age and deform after long-term use. The inner diameter is 27mm, the outer diameter is 39mm, and the thickness is 2.0mm. It is suitable for various pipe and heating device connection parts, and the sealing effect is outstanding. Designed for pipes, heating devices, water supply systems, heating installations, boiler pipes, valves and joints. Leak-proof sealing function effectively prevents water, gas or liquid leakage, keeps the system running safely and stably, and improves the system life and efficiency. The package contains: 5x sealing rings, you can apply it to multiple parts.