Use the 6 way or 12 way air manifolds for aquariums or ponds that need a lot of small air stones all over the place. (messy)
These are only 1/8" barbs and very restrictive for the air flow so the pump tends to run hot and will 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 12 way for Hakko 40 to 60
Use two 12 way for HK80L
Use three 12 way for HK100 or HK120L.
For most ponds it is better to use the Heavy Duty Manifolds.
These are available as 2 way or 4 way.
The barb outlets available are 3/8", ½” or 5/8”.
So use 3/8”, ½” or 5/8” ID hose.