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This solvent boss insert from JTM is suitable for JTM and Floplast soil strap on boss and boss pipe and is available in a range of sizes with a black finish. Features & Benefits: JTM Black Solvent Inserts For Strap On Boss and Boss Pipe - 40mm, Black, Range of sizes, For JTM and Floplast strap on boss and boss pipe, Solvent, Boss insert. JTM Black Solvent Inserts For Strap On Boss and Boss Pipe - 40mm Plastic uPVC SP21B