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 No, Flange Type Standard, Number of Mounting Holes 2, Compatible with Manufacturer Model Number 007e, 110-113, 2400-10-3P, 2400-20-3P, 2400-45, 2400-50-3P, HEC-2, VR1816, VR3452, VT2218