VPNs are two "through-type" solenoid valves: they are assembled to the manifold without the use of fittings, tools, or Teflon tape and are manually screwed together in series using a 1" female swivel ring nut with O-ring seal and 1" male thread. A compression fitting must be inserted at the outlet of the solenoid valve with 1" female swivel ring nut to connect the sector pipe. This process speeds up installation and ensures a compact manifold, allowing a total of 12 solenoid valves to be concentrated in the well for easy and convenient maintenance.