
Waterway Pump Union includes 2" union nut, 2" o-ring, and tailpiece with 2" slip fitting. 2" Slip is designed to slip over pipes with 2" inner diameter and outer diameter of 2-3/8". 2" buttress thread is only compatible with 2"* pump intakes, discharges, or plumbing listed as buttress thread. Also it fits Aqua-Flo and Balboa brand pumps with 2" threads.
Measure the Inside Diameter "ID" of your current "CLOSED" split nut or regular nut.
If it measures: