Sample Pack of Supavents, Smartvents, Intellivents, KC401875

KC401875 Pack consists of (2) of the following:
KC401850 1/2" (13mm) Supavent
KC401851 3/4" (19mm) Supavent
KC401846 1" (25.4mm) Supavent
KC401855 1/2" (13mm) Smartvent
KC401858 5/16''(8mm) Smartvent
KC401857 3/4" (19mm) Smartvent
KC401856 1" (25mm) Smartvent
KC401852, 3/4" Intellivent