Troyer tunnels to modify on other gourds OR on houses.
"Conley #2" (also known as Clubhouse entrance) Starling Resistant Entrance Hole or round. Now feature BUILT IN wing entrapment guard molded into the tunnel! The SREH tunnels will give your purple martins added protection from European Starlings.
To use the collar drill a 3 inch hole into any type of martin house; wood, vinyl (plastic), aluminum with a flat surface. Screw or rivet into place (screws and rivets not included)
UV protected polyethylene lasts and lasts without degrading. Reinforcements under the porch and traction tread installed.
Sold per each
Please note: Collar is rigid plastic and if you are needing it to be curved you must heat the plastic and cut to accommodate the curved surface of gourds. Not all gourds are amenable to drilling. These can be used to modify PMCA (Excluder brand) gourds and Supergourds. These are NOT designed to use with any HEATH gourds due to the frail composition of Heath gourds.