These Drain Plugs are designed with a molded-in recess in the base, thus trapping the sealant in place and providing a more water-tight seal. They also have a captive mechanism that keeps the plug in...
This is the best plug we've found for water ballast tanks like those found on SCAMP, as it is relatively low profile and has an easily turned T-handle.
Sea-Dog says:The Garboard Drain & Plug...
This Garboard Drain & Plug provides drainage for bilge during haul-out. Design includes integral 1-1/8" acetyl drain tube. Pipe plug ensures a watertight seal. Constructed of sturdy UV stabilized...
When you use either our T-handle or Snap Handle plugs you will get better results if you glue one of these brass drain tubes in first. Order plugs separately.