2 inch Heater Union Split Nut with Screws Type of product: 2 part union collar Specification: 2" S Most common size reference: 2 inch Overall outer dimensions approx: Max height: Max diameter: Internal diameter size: Commonly used with: 2 inch rigid pipe and 2 inch flexible rigid pipe. Used with Balboa, Gecko, Hydroquip, RMF, Thermcore, Aquatemps, Spa Builders, Brett Aqualine and more. Additional notes: Replacement split nut union with screws.