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In terms of design, gate valve wheels can be found in different shapes and sizes
. Some are equipped with a hand lever for enhanced grip and ease of operation, while others might feature a larger diameter for better torque application. The specific design chosen often reflects the valve's intended application and user requirements.There are three different types of manholes: shallow, normal and deep. “Normal” manholes are typically 4- to 5-feet deep and wide enough for the average person to fit in. Shallow manholes are 2- to 3-feet deep, often placed at the start of a sewer branch and in areas with low traffic. Manholes with a depth greater than 5-feet are considered deep and usually have an entry method like a ladder built-in, as well as a heavier cover.