The top plate, top clamp and top sleeve pack is used to support the weight of the chimney liner at the top of the chimney stack. Use this pack where you intend to remove the chimney pot, install the liner, then replace he chimney pot. You will most likely also need a chimney birdguard cowl on the top of the pot to keep out the rain and birds etc.
Place the Top Plate over the chimney recess at the top of the chimney stack. The Flue Liner should protrude throught the Top Plate hole by approximately 100mm. Insert the Top Insert Sleeve into the Flue Liner. Now place the Top Clamp over the Flue Liner and tighten the two nuts and bolts until the Flue Liner is secure againts Top Insert Sleeve. Now apply a suitable acid resistant cement as a seal and weather proof render. While this cement is wet secure the chimney pot to this cement.