This 3/4 in. pressure cup x cup coupling is ideal for air conditioning and refrigeration and potable water applications. Constructed with copper, this coupling connects straight lengths of tube and is commonly used aboveground for water supply piping. It features a solder cup and a dimple stop. This adaptor needs pressure to maintain flow and has a 582 psi, maximum working pressure. Its dezincification-resistant design protects the adaptor's mechanical strength.