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Fisher™ R622, R642, and R652 Series Second-Stage Regulators - LP-Gas
R600 Series second-stage regulators are UL listed designed to reduce the outlet pressure from a first-stage regulator in domestic installations.
Type R622 is designed for Two-Stage domestic applications up to 1 400 000 BTU per hour / 15,8 SCMH. Type R622 contains a high performance relief valve and a large 3/4-inch screened vent to limit downstream pressure to less than 2 psig / 0,14 bar in an overpressure situation. Types R642 and R652 are designed in an angle body and back mounted design.
Fisher™ R622, R642, and R652 Series Second-Stage Regulators - LP-Gas


Available Configurations
Type R622 (standard): Second-stage regulator with straight-through body design
Type R642: Second-stage regulator with 90° body design ideal for metered installations
Type R652: Second-stage regulator designed for back mount installations
Body Sizes and End Connection Styles (inlet x outlet)
Type R622: 1/2-inch FNPT, 1/2 x 3/4-inch FNPT, and 3/4-inch FNPT
Types R642 and R652: 1/2 x 3/4-inch FNPT, 3/4-inch FNPT
Maximum Inlet Pressures
Maximum Inlet Pressure: 10 psig / 0,69 bar
Emergency Inlet Pressure: 50 psig / 3,4 bar
Up to 1.4 MBTU/hr
Outlet Pressure Ranges
9 to 20-inches w.c. / 22 to 50 mbar
Pressure Registration
Temperature Capabilities
-20° to 160°F / -29° to 71°C
Approximate Weight
1.4 Pounds / 635 grams


  • Improved Accuracy
  • Superior Relief Performance
  • Corrosion-Resistant Materials
  • Inlet Screen
  • Test Ports for Easy System Checks
  • Positive Drainage
  • 20-Year Recommended Replacement Life
  • UL Listed