Phaser/Filter
RandomSource proto photo JHaible Tau Pipe Phaser
https://www.facebook.com/randomsource/photos/pb.1513108465622910.-2207520000.1435556897./1553703068230116/?type=3&src=https%3A%2F%2Fscontent-ord1-1.xx.fbcdn.net%2Fhphotos-xtf1%2Fv%2Ft1.0-9%2F10447735_1553703068230116_7662105969630065355_n.png%3Foh%3Dcac09
Available as an assembled Module and as a DIY project.
No info about availability.
How much is the fish?