Seaward 283a972 supernova plus dual serial port adaptor seaward 283a972 which seaward pat tester is best for you a href seaward style display inline block background d13631 color white text decoration none padding 5px font weight bold border radius 3px help me decide a p the seaward 283a972 is a dual serial port adaptor the adaptor is an optional accessory designed for use with seaward s europa and supernova pat testers when in use it allows you to connect two devices simult