Here is a new  pump from the estate of a camper repair facility that went out of business years ago and i bought their inventory. It looks in very good unused condition , it is numbered as a 520402 /160650 / arrow 350740 and has a 9030 stamped on the pump. It has 1/2" pipe fittings , dc 12 volt 1/2 psig and 0.29 sig.  THANKS FOR LOOKING !!!  02042018 18-1 C-4