let's face it. it is just a bloody pump, there is no rocket science in it. but not for Birzman. they have installed a nozzle to this otherwise beautiful and very functional pump, so complicated, so fiendish, that the damn thing doesn't work. Mine stopped working within a year, i bought a replacement nozzle, same story. finally, i complained to Birzman and they, to their credit, sent me new "normal" helix type nozzle, free of cost. this is a simpler design and i expect it to work. the pump and it's PSI meter works well.