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This internal boss adaptor can fit SOIL21 or a strap on boss and helps with the disposal and distribution of wastewater. Manufactured from rubber material with a black finish, this 110mm soil boss adaptor is for above-ground use. Features & Benefits: JTM Black Internal Soil Rubber Boss Adaptor - 63mm x 32mm, For above ground, Black, 110mm soil, Internal boss adaptor, Rubber material, For the disposal and distribution of wastewater, To fit SOIL21 or strap on boss, Range of sizes. JTM Black Internal Soil Rubber Boss Adaptor - 63mm x 32mm Plastic uPVC SOIL34B