A: No, it is not made in the USA.
A: This product has been discontinued. This product was manufactured in the USA.
A: There are 48 tubes in a carton. Each tube is six feet long.
A: Wall thickness is 0.49 inch.
A: You could use APT05810 which is available at homedepot.com. It has a nominal 5/8" inner diameter and has a 1" wall thickness.
A: You can purchase Model # ORP05812 by the case in the store or Model # DGT05812S online or at the ProDesk.