Comparison : Item # 12F-12FO, 3/4 Inch (in) Flange Size CD61 NPTF Thread to Flange Head Adapter
Item # 16F-16FO, 1 Inch (in) Flange Size CD61 NPTF Thread to Flange Head Adapter
Item # 20F-20FO, 1-1/4 Inch (in) Flange Size CD61 NPTF Thread to Flange Head Adapter
Item # 24F-24FO, 1-1/2 Inch (in) Flange Size CD61 NPTF Thread to Flange Head Adapter
Item # 32F-32FO, 2 Inch (in) Flange Size CD61 NPTF Thread to Flange Head Adapter