Comparison : Item # 31145, 1/2 Inch (in) Nominal Inside Diameter (ID) Drain, Waste, and Vent (DWV) Test Cap
Item # 31146, 3/4 Inch (in) Nominal Inside Diameter (ID) Drain, Waste, and Vent (DWV) Test Cap
Item # 31147, 1 Inch (in) Nominal Inside Diameter (ID) Drain, Waste, and Vent (DWV) Test Cap
Item # 31148, 1-1/4 Inch (in) Nominal Inside Diameter (ID) Drain, Waste, and Vent (DWV) Test Cap
Item # 30770, 1-1/2 Inch (in) Nominal Inside Diameter (ID) Drain, Waste, and Vent (DWV) Test Cap