1. Lab Report: Recent research into 12v pump design indicates that an all-metal or super heavy duty plastic pump head is more desirable than an economy sized one. As well, more PSI never hurts. We are switching to a 4 gallon per minute, 60 PSI pump after the mechanical failure of our 3 gallon per minute RV pump from Surflo. The North Star equivalent from Northern Tool ($89) also has replacement parts. Photo here shows the head of the pump with a broken off port.