Flange Bolt Hole Size 0.25 in Compatible Pipe Size 1 in Compatible with Brand Taco Compatible with Grainger Part Number 5CHJ9 5CHK1 5CHK7 Compatible with Series 110 2400 Compatible with Series Family 110 2400 Flange to Pipe Connection Type FNPT For Use With Potable Systems Yes Flange Type Standard Number of Mounting Holes 2 Compatible with Manufacturer Model Number 110-113 2400-10-3P 2400-20-3P 2400-45 2400-50-3P Compatible with Pump Type In-Line Circulating Pumps