Tube inside diameter is 8" x 26" long and will hold a tuna up to 20 pounds.
Both Tubes feature quick disconnect mounting brackets, for transom mounting are anodized then white powder coated for long life. Easily removable by removing one 3/16" detent pin. Small transom mount nuts mount to transom, tuna tube brackets clip to nuts. * PFTT-80 Tuna tube set comes with 6 inch insert for smaller bait. Plumbed for 1" hose. Double's are 2 sets of brackets mounted together, only require 4 mounting nuts on transom.