UA's Record Sensor ™ is secured in watertight casing in the shoe's midsole so it won't get wet or damaged (underarmour.com)
A rigorous testing procedure ensured watertight sealing for all doors. (topspeed.com)
I'm always somewhat dispirited by the tendency to answer criticisms about the coherence of religious belief with a sort of watertight defense of its rationality. (religion-online.org)