Features:
• Replacement Cartridge Design
• Efficient/quiet Operation
• Universal Flange to Flange Dimension
• Cast Iron or all Bronze Construction
• CSA/UL Listed Circulator
• Maximum Working Temperature: 230˚F (110˚C)
• Maximum Working Pressure: 140 PSI
• Same face to face dimension as Armstrong's S-25 and other popular boosters
• All dimensions in inches
• Astro Circulators accept companion flanges of 3/4", 1", 1 1/4" and 1 1/2"