Low Pressure Second Stage Regulators
LV4403B Series


Designed to reduce first stage pressure of 5 to 20 PSIG down to burner pressure, normally 11” w.c. Ideal for medium commercial installations, multiple cylinder installations and normal domestic loads.


  • Large vent helps prevent blockage and has ¾" F.NPT for vent piping.
  • With 15 PSIG inlet pressure, regulator is designed to not pass more than 2 PSIG with the seat disc removed.
  • Incorporates integral relief valves.
  • Replaceable valve orifice and valve seat disc.
  • Straight line valve closure reduces wear on seat disc.
  • Unique bonnet vent profile minimizes vent freeze over when properly installed.
  • Large molded diaphragm is extra sensitive to pressure changes.
  • Built in pressure tap has plugged 1⁄8" F.NPT outlet. Plug can be removed with a 3⁄16" hex allen wrench.
  • Select brown finish.


Body Die Cast Zinc
Bonnet Die Cast Zinc
Nozzle Orifice Brass
Spring Steel Valve Seat Disc Resilient Rubber
Diaphragm Integrated Fabric and Synthetic Rubber