A shower arm is a plumbing component that connects the showerhead to the water supply coming from the wall. The "Shower Arm L Type" likely refers to an L-shaped shower arm. An L-shaped shower arm is a type of shower arm that has a 90-degree bend in the middle, forming an L-shape. This type of shower arm is designed to extend the showerhead away from the wall, creating more space for showering. L-shaped shower arms come in various sizes and finishes, including brass, stainless steel, and chrome-plated metal. They can be either fixed or adjustable in length. The choice of shower arm depends on personal preference and the shower design. An L-shaped shower arm may be preferred for its space-saving design, especially in small bathrooms or shower enclosures.