Forespar Sta-Plug Emergency PlugSta Plug Emergency Plug Sta Plug is Forespars new form fitting emergency plug. A soft cone shaped design allows it to easily fill the irregular shapes of hull impact breaches, as well as any round hole leak from a hose or through hull. Unique edge gripping riblets help hold the plug in a hole, keeping water out. The riblets help Sta Plug conform to the shape of the hole, sealing a leak near the edge where a tight fit is crucial, and holding the plug