Bought my Airdog from sourceautomotive. biz. The kit was complete. Friend bought his Airdog from unknown other vendor. It didn't quite have everything. I left the stock system intact. I used a large piece of shrink tubing on the original fuel connection at the stock fuel filter. If the Airdog ever has a problem, I can reconnect the original hard line at the stock fuel filter and move a single electrical connection. Should take about 15min on the side of the road.
I connected the Airdog to the original filter to maintain the fuel heater. I can get cold for a few days a year where I live.