PVC hose is a type of pipe used to transport water or liquids, commonly used in agriculture, gardening, construction and household use. They can come in different colors based on different application needs and preferences. Here are some common PVC hose colors and their possible uses:

1. Blue: Blue PVC hose is usually used to supply clean drinking water, such as connecting to the tap water system in domestic uses. They can also be used in cooling systems or other applications.

2. Green: Green PVC water tape is usually used in horticulture and agriculture fields for irrigation and plant watering. They are also sometimes called "garden hoses."

3. Orange: Orange PVC hose is commonly used on construction sites and construction projects for easy identification at construction sites. They are also used in municipal works and drainage systems.

4. Yellow: Yellow PVC hose tape is often used to mark liquids of hazardous nature, such as chemicals or hazardous waste. This helps workers know exactly what the hose is intended for, ensuring safe operation.

5. Red: Red PVC hose is sometimes used on fire alarm systems, such as fire hydrant or fire extinguisher connections. The color red is easily identifiable and associated with fire alarm equipment.

6. Black: Black PVC hose is usually used in drainage systems such as stormwater drainage pipes.

7. White: White PVC hose may be used in some special applications, depending on the demand. The white exterior is generally more suitable for home and decorative purposes.

Please note that these color standards may vary by region and manufacturer. The color of PVC hose should be selected considering its specific use to ensure that relevant standards and regulations are met. Also, make sure to use PVC hose that meets quality and durability requirements to prevent leaks and damage.