virginiafiretruck. that looks like the same unit as on my 1959 4400 series. they told me you could't buy a rebuild kit because of new federal regs.you need to be certified to rebuild them. more federal b.s. tore mine apart,fairly simple,and found the leather piston seal all gummed up. was a reman. and had been assy. with grease. cleaned it up,soaked it in oil,i used marvel mystery oil,any light weight oil should work, put it back together and it works fine.it could save you a couple hundred bucks to try this. there a fairly simple unit. galen
