Air pumps

[Shas]

Man, this thing is way bigger than I thought it would be

Yeah, they are substantial machines.
Here is my Pondmaster AP-100:


with 500ml bottle of Marinis
(that's the Canadian version of Maxicrop)
for scale reference.
The manifold has 33 two-step nipples
which accept 1/4" or 3/8" air line.
Rated for 10,000 gallons.
These are serious air pumps!
And the rebuild kit is only $14, even here in Canada.