Comments: Here is a link to the Hagen instructions, including how to replace the diaphragms.
<br />http://www.hagen.com/uk/aquatic/manuals/maxopt01.cfm

Comments: i love the fact that you can repair the hagen air pumps instead of having to buy another one. I repaired my optima pump in 20 minutes and it works like a charm. thx MD

Comments: great air pump works like new again

Comments: Good product pump works like brand new again. It was easy to install this kit in the pump.

Comments: Pay close attention to the position of the holes in the white plastic cup that the rubber diaphram connects to. Tools needed-tweezers and wear your glasses. It only took me 10 min to rebuild the pump.

Comments: A dirt cheap way to restore your pump to new performance.
<br />I had the pump running continuosly out at my koi pond for seven months, in single digit temps to low 90's.
<br />
<br />The drawing with the kit is lacking in detail, but gives some idea of how the pump is assembled. You need to note the position of the original parts in the diaphram assembly when taking it apart, or you might not get put back together properly.
<br />
<br />If it lasts six months without rebuild in the harsh outdoor condition of the high plains of New Mexico, I'll be happy. Indoors I would imagine these parts would last a year or two.

Comments: What can I say. It works.

Comments: Very good products. Shipping response time and communication is second to none.

Comments: As always, a fast pleasent experience with Marine Depot. Easy to install and it fixed all my problems.