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Model: MW708 McAlpine Rodent Barrier 4"/110mm Anti Back-Flow and Rodent Barrier Valve For use where special measures are necessary for control of rodents as recommended in Approved Document H1 The Building Regulations 2000 (2002 Edition) Prevents back flow when fitted to WC pans as long as they are connected to the correct configuration of drain and soil pipe on a system and comply with the current building regulations and BS EN 12056-2:2000. Deters rodents from entering the building through WC Can be installed horizontally or vertically Manufactured in black polypropylene to prevent light penetration | 
