19mm Silicone heater 2 ply hose is a type of hose made from silicone rubber that is designed specifically for use in heating and cooling systems. These hoses are commonly used in vehicles, industrial equipment, and other applications where resistance to high temperatures, flexibility, and durability are essential. Here are some key features and uses of silicone heater hoses:

1. Temperature Resistance: Silicone heater hoses are known for their excellent resistance to high temperatures. They can withstand both hot and cold extremes, making them suitable for use in engine compartments and other environments where temperature fluctuations are common.

2. Flexibility: Silicone rubber is a flexible material, allowing these hoses to bend and flex without kinking. This flexibility makes installation easier and allows the hoses to navigate tight spaces.

3. Durability: Silicone heater hoses are durable and resistant to degradation from exposure to heat, ozone, and other environmental factors. This durability contributes to a longer service life compared to hoses made from other materials.

4. Insulation Properties: Silicone rubber has good insulation properties, which can be beneficial in applications where electrical insulation is important.

5. Corrosion Resistance: Silicone does not corrode or react with metals, making it a suitable material for use in conjunction with various metals commonly found in heating and cooling systems.

6. Color Options: Silicone heater hoses are often available in different colors, allowing for easy identification and customization.

7. Applications: These hoses are commonly used in automotive applications, such as in coolant systems, heaters, and other components of the engine cooling system. They are also employed in industrial equipment, appliances, and wherever a combination of high-temperature resistance and flexibility is required.

When selecting a silicone heater hose, it's important to consider the specific requirements of the application, including temperature range, pressure rating, and hose dimensions. Additionally, proper installation and maintenance practices should be followed to ensure optimal performance and longevity.