For 35 bucks I can modify your old or new TETRAtec DEEPwater DW 96-2 air pump . After modification the air flow will have increased 2 to 3 times that of factory stock. I also reinforce the seal on the air reservoir/compartments, which have been known to leak under normal use. I have done the modification to both of my Dw 96-2 and the airflow has double or tripled to say the least. The first one have altered has been modified for at least 7 years with no problems for years except for 1 of the 4 diaphragm started leaking, which I had to replace. I just modified my other DW 96-2 yesterday. Man what a deference in the air flow. You could not believe what a deference the modification makes. I can modify your air pump and be ready for pick up in 1 hour after drooping it off. Any questions feel free to call 718 792 2593