Each connector kit contains 4 feet of oval flex pipe, a 48" block-off plate, Owens-CorningTM high temp gasket, stove fitting, support poles, and hardware.
Model 4876
Has a 6" round inlet (28 square inch area) Oval flex pipe is 4-1/4" x 9-1/2" x 4'
Model 4877
Has a 7" round inlet (33 square inch area) Oval flex pipe is 4-1/4" x 11" x 4'
Model 4888
Has a 8" round inlet (50 square inch area) Oval flex pipe is 4-1/4" x 14-1/4" x 4'