The Matala Heavy Duty Air Manifold has two functions. It can decrease back pressure on your pond aeration system, and it can be used to distribute air from your aerator to several diffusers. The brass manifold connects to the air pump via a 3/4" barb.
This brass splitter/diffuser manifold is made with 2 or 4 outlets. The 2-way and 4-way styles are available in several barb widths.
2-way: 3/8" barb, 1/2" barb, or 5/8" barb
4-way: 3/8" barb, 1/2" barb, or 5/8" barb
I have a hydroponic garden and tried running large volumes of air through smaller manifolds, limiting my choice of diffusers and adding quite a bit of heat to my system. The Matala manifolds run cooler and allow me to use larger 3/8 inlet diffusers. As an aside, Cody at Pond and Garden really went above and beyond to get the manifolds to me at an excellent price point and in a timely fashion.
Manifold is of decent quality, materials, machining, etc. Does not include relief valve or liquid-filled gauge accessories.