A drainage cap is a small, often circular cap that is used in PVC doors to provide a drainage outlet for water that may accumulate in the door frame or panel. PVC doors are typically used in areas that are exposed to moisture, such as bathrooms or exterior doors, and the drainage cap helps to prevent water from pooling inside the door frame or panel.

The cap is usually made of PVC, which is a durable and waterproof material that can withstand exposure to moisture and weathering. The drainage cap is designed to be installed at the bottom of the door frame or panel, where it can allow any water that accumulates to drain out.

The benefits of using a drainage cap in a PVC door include:

• Preventing water damage: The drainage cap helps to prevent water from pooling inside the door frame or panel, which can lead to water damage, mold, or mildew.
• Maintaining door integrity: By allowing water to drain out, the drainage cap helps to maintain the structural integrity of the door and prevent warping or swelling.
• Easy installation: The drainage cap is simple to install and can be easily fitted to the bottom of the door frame or panel.
• Long-lasting: PVC is a durable and long-lasting material, which means that the drainage cap is likely to last for many years with minimal maintenance.

Overall, a drainage cap is an important component of a PVC door, as it helps to prevent water damage and maintain the integrity of the door over time.