M_Boats: Advice sought: Cockpit drain tubes

Hi All: I have an older Monty with steel swing keel and aluminum tubes connecting cockpit drain hose to bottom of boat. The aluminum tubes have deteriorated and one fell apart when I was trying to remove the now rigid hose.  What sort of tube is available for this repair. All of the PVC pipe I found was either too big or too small. The ideal pipe would have an outside diameter of 1 1/2". Thanks in advance for your suggestions. Leif Eriksson