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Apollo® check valves in the 61-600-A0 Series have 2-inch copper tubing at both ends to allow installation in seconds, using the Viega no-solder ProPress™ crimping system, states the manufacturer. They are available in 1/2- to 2-inch sizes. These check valves feature a spring-loaded check for faster seating action, states the company. They feature an all-bronze body, stainless steel springs, and elastomeric seats. According to the manufacturer, the springs are fully protected from the flow stream and the valves do not require radial alignment.