Contain three parts ①internal lid, ②corbel, and ③base. The internal lid is locked onto the corbel tightly to prevent the water penetration. The opening diameter of corbels is 31 1/2". The base is connected with oil tank manhole via square upstand flanges.
SSS 125090 Base 48"x20"
SSS 125091 Base 48"x20"，conductive
SSS 127090 Base 48"x28"
SSS 127091 Base 48"x28"，conductive
SSS 129090 Base 48"x36"
SSS 129091 Base 48"x36", conductive
SSS 145090 Base 55"x20"
SSS 145091 Base 55"x20"，conductive
SSS 147090 Base 55"x28"
SSS 147091 Base 55"x28"，conductive
SSS 149090 Base 55"x36"
SSS 149091 Base 55"x36"，conductive
SSS 165090 Base 63"x20"
SSS 165091 Base 63"x20"，conductive
SSS 167090 Base 63"x28"
SSS 167091 Base 63"x28"，conductive
SSS 169090 Base 63"x36"
SSS 169091 Base 63"x36"，conductive
