Hey Ricky! It's for the fish
(Some pumps sell diaphragm kits)
Those elite pumps are quite good value if you can get the complete kit versions, sometimes they come with airline/stones etc. all you need is the airline plumbing pieces (little elbows and T's etc)
Do you have a back pressure release built in?
It's simple enough, put a T piece inline and fit a valve to it.
(Several examples here)
This is open aired and stops pressure on the diaphragm, prevents premature failure. It is open just very slightly, just enough to ease the pressure. If the pressure builds up it will bleed off through this valve instead of returning back to the pump.
1 of my elite pumps is slightly noisier than the rest (sign of a bad diaphragm) still pumps air at the moment. They are all at least 5 or more years old.