Exhaust Kit includes piping from pump with P-Trap, drain and 23 inches schedule 80 1 � inch pipe. Inlet Kit includes hose and fittings from air water separator to vacuum pump.This is the maximum number of users during normal working conditions (includes diversity). for 100% redundancy (back up / spare) do not count 2nd motor in calculation.Larger capacity and continuous run air water separators are compatible with 1HD systems. Systems come complete with: air/water separator, auto drain kit, quick disconnect hose kit, inlet piping kit and exhaust piping kit.