A cap is a hose fitting that is designed to attach on over the outside of a tube end. The purpose is to dead-end / stop the flow. For instance, plastic hose caps are used to cover rigid tube and hose ends as well as to prevent slippage over the fitting though the primary application for these caps is hose assembly manufacturing.

These caps can be fitted or attached in a number of ways. Various attachment techniques, depending on application and material, include

A few of the common types of hose caps are:

Hose caps can be manufactured in various sizes and from different materials like:

Flexible plastic hose caps are popularly used to seal off unused hoses. They fit over the metal mouthpiece of the hose for an air tight seal. These can be fabricated to be compatible with any size hookah hose and have high heat resistance.

Various other types of caps are designed to protect virtually any product and for almost any application. This includes threaded and tapered caps, flange covers, and static protective caps for product protection during shipping, packaging, or production processes.