What is grommet? Silicone grommet is a small round part made of silicone rubber that is used to protect and seal wires, hoses or pipes when they pass through a panel, wall or frame. The coil is designed to absorb vibration, reduce noise and prevent wear and tear on the wire or other parts that pass through it. Silicone grommets are commonly used in automotive, electrical and mechanical applications because they are able to withstand high temperatures, water, oil and chemicals. They can be found in a variety of shapes, sizes and colors to meet specific requirements.