A gas charging line, or refrigerant charging line, is a flexible hose used to connect a refrigerant cylinder to an AC system for the purpose of adding or removing refrigerant gas. These lines are typically color-coded (blue for low pressure, red for high pressure) to help technicians avoid errors when connecting to the correct ports on the AC unit.

A soft copper pipe is easy to bend and does not need additional turning tools. Inflexible, rigid copper piping, on the other hand, usually needs bending equipment.

Rubber Sleeve: A Rubber Sleeve is a basic type of coupling. This consists of a pipe whose bore is finished to the required tolerance based on the shaft size. Rubber Sleeves and buffers can be manufactured in a range of shapes, sizes and material to suit the application.