Matala Hakko HK-D Replacement Diaphragm Kit for Hakko 40L air pump.
Tools needed to replace the diaphragms:
- 1 medium phillips screwdriver.
- 1 small phillips screwdriver.
- 1 medium pair of pliers.

If diaphragms are needing replaced regularly, then check the following:
- Make sure that the air tubing is not kinked.
- Make sure the air tubing is the correct size diameter (too small of a diameter will cause back pressure).
- Make sure air diffusers are not clogged.
- Make sure the number of air diffusers is enough to handle the air output of the Hakko pump.