I bought the Petsafe Staywell delux magnetic 4-way catflap to replace an ageing Staywell model of the same design which had started to allow non-magnetic cats to head-butt their way into the house, eat all the food, use the toilet facilities and generally doss about the place as if it was a Burger King on a motorway. It fitted exactly in the same position as the Staywell version . After testing it out unsuccessfully with a few resounding headbutts , all the would-be hooligan cats departed abashed, with headaches , and our resident moggies are delighted to have a secure home once again. Purrfect. Thank you for your prompt attention and excellent service. Huw-Lloyd-Hughes