Comparison : Item # B1510A, 1-1/2" x 1"
Part B Coupler x Male NPT
Reducing Cam and Groove Coupling
Item # B2015A, 2" x 1-1/2"
Part B Coupler x Male NPT
Reducing Cam and Groove Coupling
Item # B2030A, 2" x 3"
Part B Coupler x Male NPT
Reducing Cam and Groove Coupling
Item # B3020A, 3" x 2"
Part B Coupler x Male NPT
Reducing Cam and Groove Coupling
Item # B3040A, 3" x 4"
Part B Coupler x Male NPT
Reducing Cam and Groove Coupling