A proven flood prevention method that helps to protect your home, this 110mm non-return valve from Flexseal allows sewage and other materials to flow freely through your drainage system whilst preventing the backflow of such materials from reentering your home via toilets, plug holes and waste pipes during floods. Not only is this non-return valve easy to install, but it is also unobtrusive and requires no specialist tools or additional maintenance once it has been installed into your desired existing pipe inlet. As well as blocking solid materials from backflowing into your property, the non-return valve can also protect your home or business from rat infestations. Features & Benefits A simple push-fit design makes installation quick and easy Unobtrusive when installed Two sizes available to suit DN100 and DN150 pipes Universal for all pipe materials within the products size range Protects against backflow and pests, such as rats and other rodents Stainless steel reinforced flap for added protection against rodent infestation NRV100 WRc Approved Please note this is not compatible with OSMA inspection chambers.