DIP TUB IS EASY TO REPLACE MINE WAS JUST DONE BY OUR GAS COMPANY. TAKE INLET PIPE OFF AT THE HEATER AND PULL IT OUT IF IT IS STILL THERE, MINE WAS GONE JUST THE LIP RING WAS THERE. THEY DROPPED A NEW ONE IN AND IT IS GREAT. IN CANADA THERE HAVE QUITE A FEW REPAIRS UNDER WARRANTY ON THIS ITEM AND THE COMPANY IS COVERING THE COST.