The Roof-Nek is available in one standard size. This product is an ideal solution for small pipe and cable entry points. The internal diameter of the Roof-Nek is 52mm.  Height 556mm The Roof-Nek is made for waterproof durability encompassing an easy access design which includes: Spun aluminium base Large area to bond waterproofing Detachable lid for ease of access Future-proof: allows sufficient clearance for future water-proofing under existing services, without the need for de-commissioning A pipe/cable port plate with knock-out holes.