Rod Holder Drain Cap
This molded, black vinyl rod holder drain is the perfect solution when you need to route the drainage from T-H Marine's molded angle top (RH-1) or flat top (RH-2) rod holders. Simply slip this cap onto the base of the rod holder and use 3/8" clear PVC tubing to route drainage from bottom tip.
T-H Marine sells them, about $4 each when I bouht them a few years ago, part number RHBD-1.