BASF TX1 Sonolastic Roof Sealant used to seal the  flashing to the roof.  This is a 10.1 oz. standard tube for a caulking gun.

Solatube recommends:

• 1 tube for 10" Daylighting system


• 2 tubes for 14" Daylighting system


• 3 tubes for 21" SolaMaster system