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