Modutank Inc. offers a line of flange-type bulkhead fittings, with a single hole penetration. These modular tank pipe fittings minimize potential leaks by eliminating through-the-wall bolts and corresponding holes. They are sealed to the tank wall with a series of gaskets and ModuTank’s specially designed external pressure plate system. Connection is achieved by adjusting pressure on the gaskets that seal the fittings to the wall.