The HE30 Series is a 3-valve equalizing manifold that is a compact and cost effective alternative to the more costly 5 valve manifold. Derin or Teflon soft seat valves insure redundant equalizer isolation, eliminating the possibility of costly leaks there, or through the vent/calibrate valve. That feature coupled with Hex's innovative Non-Rotating soft seat stem tip insure accurate resource accounting and long valve life.