A backflow preventer that includes a housing having an inlet and an outlet adapted to be mounted in a liquid flow configuration in a liquid supply circuit. An upstream check disc assembly is positioned in the housing downstream of the inlet, and includes an upstream check plate supporting a downstream diaphragm. An upstream check disc is positioned downstream of the diaphragm and integrally formed with an upstream stem mounted in an aperture in a central hub formed in the check plate for movement between an normally open, flow position and a closed position preventing backflow of liquid through the inlet. A downstream check disc assembly is positioned in the housing downstream from the upstream check disc assembly. A vent discharges liquid to atmosphere upstream of the downstream check disc assembly.

A tube coupling device having a check valve contains: a coupling body and a valve assembly. The coupling body includes a tubular member and a circular connecting seat, the tubular member is hollow to flow water, and the coupling body also includes an isolation sleeve for covering on an inner wall of the tubular member, such that the isolation sleeve separates the water from the tubular member, and the isolation sleeve has a flow channel for flowing the water. The locking set is disposed between the tubular member and the isolation sleeve and includes a protruded rib extending inwardly around the tubular member and retained between the isolation sleeve and the tubular member. The locking set also includes a retaining groove formed on the isolation sleeve and retaining with the protruded rib, and the retaining groove engages with the protruded rib and covers three sides of the protruded rib.

A water capturing device is provided having a body which is operatively engageable with a spigot assembly having a spigot with a vacuum breaker thereon. An axial passage of the body of the device, when in operative engagement, collects and redirects water expelled from the vacuum breaker downward out a discharge opening where it may be collected and used elsewhere.

A water capturing device is provided having a body which is operatively engageable with a spigot assembly having a spigot with a vacuum breaker thereon. An axial passage of the body of the device, when in operative engagement, collects and redirects water expelled from the vacuum breaker downward out a discharge opening where it may be collected and used elsewhere.

A water capturing device is provided having a body which is operatively engageable with a spigot assembly having a spigot with a vacuum breaker thereon. An axial passage of the body of the device, when in operative engagement, collects and redirects water expelled from the vacuum breaker downward out a discharge opening where it may be collected and used elsewhere. A reservoir may be positioned to collect water from said discharge opening. The reservoir may be fluidly coupled with a fluid container to collect the water therein for transport and use.