Mechanical:
I am going to layout a basic physical design then run some calculations.

2 x Stainless Pipe 2.5” nom. (2.88” OD x 0.12” Wall x 2.635” ID) Cut to 60”
120$ after shipping from Amazon(Metalonline)
4.07 Liters per pipe

1 x Stainless Pipe 2” nom. (2.38” OD x 0.11” Wall x 2.157” ID) Cut to 72”
140$ after shipping from Amazon(Metalonline)