Matala / Hakko HK-D Replacement Diaphragm Kits | 4 Sizes

Hakko and Matala air pumps are the standard for most koi pond and water garden aeration needs. However, like any other machine with constantly moving parts there is a possibility for components to wear out over time. Much like a pond pump impeller, an occasional diaphragm replacement will increase the air pumps life expectancy and overall performance. 

For detailed instructions on how to replace the diaphragm, take a look at the instructions under the "downloads" tab. 

Tools needed:
- 1 small Phillips screwdriver
- 1 medium Phillips screwdriver
- 1 medium pair of pliers

Available Models:

Rebuild Kit # HK-D25 for 25L Air Pump

Rebuild Kit # HK-D40 for 40L Air Pump

Rebuild Kit # HK-D60 / HK-D80 for 60L & 80L Air Pumps

Rebuild Kit # HK-D100 / HK-D120 for 100L & 120L Air Pumps.

Please Note:

If your air pump has frequent diaphragm blow-outs you most likely have excess back pressure resulting from an incorrect set-up.

Ensure air delivery tube is large enough in diameter and there is no kinking.

Ensure air diffusers are not clogged. Ceramic stone style aeration diffusers require a muriatic acid cleaning every 3 months.

Check that the size and number of air diffusers is sufficient to handle Hakko / Matala air output. Not having enough outlets or diffusers will create excess back pressure.