This FloPlast gully riser is used to increase the height of a FloPlast 110mm bottle gully. The overall height measurement of this riser is 205mm with a 160mm diameter. Use this riser in conjunction with our FloPlast brand bottle gullies. If you are using our PBSL brand gullies you should use the BG505 riser. Compatible with the following gullies: D510 - FloPlast Drainage Bottle Gully Circular Grid - 110mm, D515 - FloPlast Drainage Bottle Gully Square Grid - 110mm, D520 - FloPlast Drainage Bottle Gully Rectangular Grid - 110mm, D530 - FloPlast Drainage Back Inlet Bottle Gully Rectangular Grid - 110mm, D540 - FloPlast Drainage Back Inlet Bottle Gully Circular Grid - 110mm. The FloPlast 200mm Black Bottle Gully Riser enables you to remove the lid from the FloPlast Bottle Gully products and extend the height of the lid by 170mm. It can be used on new or existing gullies, and is easily installed by a push-fit joint and the hopper located in the socket of the riser.