Isolation Flange, Bolt Hole Size 0.44 in, Compatible Pipe Size 1 in, Compatible with Brand Bell and Gossett, Compatible with Grainger Part Number 4JA83, 4JA84, Compatible with Series 100, LR, PR, Compatible with Series Family 100, LR, PR, Flange to Pipe Connection Type FNPT, For Use With Potable Systems Yes, Flange Type Isolation, Number of Mounting Holes 2, Valve Type Ball, Compatible with Manufacturer Model Number 1BL001, 1BL012, Compatible with Pump Type In-Line Circulating Pumps