I replaced my Shurflo Smart Sensor this last spring with the 4048. My research, for what it is worth, was that the repair kit was no longer available and the 5GPM was also no longer available. It was a direct replacement. It is a little noisier than the original but I don't see a drop in water flow. There are other brands recommended by the forums for replacement, but I stayed with Shurflo.
2004 MERDIAN 36G Freightliner & CAT C7 330