Use the 6 way or 12 way air manifolds for aquariums or ponds that need a lot of small air stones in various locations around the pond. These are only 1/8″ barbs and can restrict the air flow if too few outlets are used.
If insufficient outlets are used for the air flow, it can cause the pump to run hot and could wear out the rubber diaphragms sooner than desired.
The pump will still work but the diaphragm lifetime is shorter.
Use 6 way only for Hakko 25. Use all 6 outlets.
Use 12 way for Hakko 40 to 60. Use all 12 outlets.