I really lucked out ,a relative who has been scuba diving for 20 years told me of a dive shop not 5 miles from my home , i called them up and he does fill to 4500,i mentioned that this was not for diving ,he said no waiver needed,as long as tank is marked with good hydro ,thats all that is needed. That is great ,and my friend sold me one of her tanks ,so now i will order 44cu.ft 4500 for my new 909S.
Thanks for all your replies,Paul :)