The procedure is slightly involved but makes a nice installation. I tried a few different PVC pipes but settled on this one http://www.mcmaster.com/#4740k65/=xdpeph because it bends nicely without cracking and bubbling. It is 1.660 OD (standard for Sch80) so first you have to turn the ends, or the whole thing, down to 1.5 to fit the hoses. Easily done even in a cheap lathe, cuts like butter. Then insert a suitable spring inside to keep it from collapsing. It needs to be just a slightly loose fit or you won't get it out. Packing with sand or something like that might also work, haven't tried. I make a bent wire or thin ply template of the bends (I have some more complex compound ones elsewhere). Heat with a heat gun until it gets rubbery, then a little more, bend slowly to shape, hold there while it cools. A couple of practice pieces helps, but you get pretty good at it quickly. Electricians do this all the time for conduit, the have nice ovens and tools, if you happen to know one. I found it easiest to clamp one end with a piece of wood shaped to the diameter of the tube, then you are dealing only with one end. There is a minimum radius it will bend to before the inside wall begins to wrinkle - around 5 or 6" CL diameter I think. You can do this with Home Depot 1 1/4 sch80 conduit, but it seems to crack more easily on the outside radius, and has a smaller plastic range in temperature. Plus with the clear you can see what you had for dinner.

In places where I wanted to use PVC fittings I leave it unturned at that end (original diameter) so you can glue it with standard PVC glues. Here is another picture, this is the forward head pumpout getting fit up. From the wye to the pump it was turned to 1.5 full length, the other piece going up to the deck pumpout you can see the step where it is original diameter. This installation would have been tough to do with hose.