Fine and Coarse Thread drum plug examples

SPP-L10V-9WL – 2″ Yellow Coarse Thread Vent Plug on Left SPP-L16V-9WL – 2″ NPS Fine Thread Yellow Vent Plug on Right
SPP-L10-WL – 2″ Buttress/EPDM Gasket Coarse Thread Plug on Left SPP-L16-WL 2″ NPS/EPDM Gasket Fine Thread Plug on Right