Sta-Plug® form fitting emergency plug by Forespar. 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 helps to improve sealing and holding the plug more securely in place. Large Sta-plug will fit up to 10cm gap, Mini Sta-plug up to 4cm gap