Manholes are covered by very heavy removable metal plates. According to Untapped Cities, a website that explores New York City, these manhole covers generally weigh between 200 and 300 pounds (90 and 136 kilograms) and are made from concrete or cast iron. Each manhole opening contains a lip around its edge on which the cover sits. These covers protect unwary pedestrians from inadvertently falling into the sewers, but also protect the sewers from debris, such as trash or organic materials, which typically collects on streets and could potentially clog sewers and water systems.
Air hose repair clamps are designed to provide a reliable method of sealing damaged areas on hoses, preventing air leaks and ensuring that tools receive a consistent supply of compressed air. These clamps come in various sizes and designs, making them suitable for different types of hoses and the severity of damage. The most common repair clamps are typically constructed from durable materials such as stainless steel or aluminum, which can withstand the stress and pressure associated with high-airflow applications.
