API 650 Shell Manway Gasket 20"
Nominal Shell Manhole Size: 20"
Standard Dimensions: 28-3/4" OD x 20" ID - (28) 7/8" BH on 26-1/4" BC
Nominal Shell Manhole Size: 20"
Standard Dimensions: 28-3/4" OD x 20" ID - (28) 7/8" BH on 26-1/4" BC