I am reworking the ballast system in a 2000 air nautique. I realize that pretty much everyone goes with flexible tubing, but is there any specific reason to no use pvc pipe? It is so much cheaper and seems like it could make for a very clean install.
My thoughts as to why someone may not use it:
1) may become brittle
2) may knock around in boat crack
3) harder to work around once installed (e.g., can just move a flexible tube out of the way
4) More prone to cracking during a freeze if not completely drained
glued / cemented/ soldered connections are not coast guard approved because, the amount of vibrations seen in a boat over time can cause those types of connections to fail. Thats why all plumbing from the factory is hose, hose barb, hose clamp.