Question … from the dimensions listed for the housing I am assuming that it is Schedule 40. Is the material standard Acrylic or some other thermoplastic variant of Acrylic?
The tube is 4.5" OD, 4" ID cast acrylic - which is equivalent to Schedule 40.
I had a look at the design and documentation of the BlueROV. Congratulations on a nice clean practical package, especially the pressure proof housing and cable entries.