Please see also Fitting a Petflap into glass and Fitting a Petflap into a wall.

We recommend having your Petflap fitted by a professional experienced in this sort of work, as poor fitting can affect the Petflap’s performance. We accept no liability for inconvenience or expense arising from faulty fitting or Petflaps developing a fault in use, though we will be keen to help. Please ensure the instructions in our fitting leaflet are followed carefully.

We recommend fitting a Petflap with silicone sealant, just as we do for the Ecoflap. If your door has panels please measure the door prior to purchase to see whether the Petflap can fit within one panel.

Download the PDF version of the fitting instructions here.


draughtproof pet doorYour Petflap fits into the door from outside, and is complemented with a sliding rear collar fitted from inside. This rear collar doesn’t have a structural functional but helps to keep the inside of your door neat.

The Petflap is designed to fit doors up to 50mm thick. If your door is significantly shallower than that you will have a protruding element of trunking after fitting a Petflap, but we find cats like to use this as a step as they go back and forth. 


To ensure a snug weatherproof fit please read these fitting instructions and follow them carefully.

1. Preparing your door

If you already have a pet door fitted where you intend to fit your Petflap, remove it and clean up the aperture then follow the instructions from ‘Sizing’ below.

If this is the first pet door fitted into the door identify carefully where the Petflap is to go. Pet doors should be fitted towards the hinge side of a door rather than the handle side, and should sit between panels. Where possible avoid cutting into cross-door panels. Your door should be clean and dry before fitting the Petflap. Check that your door is level and flat. Silicone sealant can compensate for a slight distortions in the door.

2. Sizing
The rear collar also acts as a template. Place it on the appropriate place on the door – a blob of sticky tack or piece of tape can help at this stage. Carefully mark the inner edge on the door.

3. Fitting a Petflap

When looking from the inside of the door, fit the Petflap with the locking mechanism at 9 o’clock. The Petflap should push through the hole from the external side of your door with the plate pushed flat against the door’s external surface.

We recommend fixing your Petflap to the door with silicone sealant. With a little care the sealant can be removed if you need to move the Petflap. Apply sealant to the flat suface of the external front plate that will be pressed against the front door. Press the Petflap firmly against the door. Carefully do the same with the template, which now forms a rear cover for the inside. Take care to secure the main body of the Petflap so as to not to push the Petflap back through the hole when fitting the
collar plate. With a damp cloth, wipe away any excess sealant front and back.

After fitting a Petflap if it isn’t sitting as snugly shut as it should, run through the following:

  • use a spirit level to check that your door is completely flat and level and that the Petflap hasn’t become warped by fitting to a slightly off-level door
  • make sure there isn’t a build-up of dirt in the bottom jamb
  • if your Petflap has been painted or covered ensure no paint or vinyl has got into any of the moving parts, forming an obstruction

Locking mechanism
This is a simple mechanical lock that can be locked open or shut. When training a pet to use the Petflap lock the flap slightly open giving the animal an understanding of how to open the flap. Once your pet is familiar with going in and out through the flap, return the lock to the open position for normal use, and lock it when preferred.

Painting your Petflap
Petflaps can be spray painted with Plastikote or covered in vinyl. When priming and spray painting, ensure the Petflap is shut and its windows are covered with tape. Under no circumstances spray into the mechanism. The Petflap is not suitable for hand painting. Please note that we can’t accept for a return any Petflap that has been modified in any way.

Your Petflap will give you and your pets years of service with no more than a wipe down now and again. Pay particular attention to grit and dirt in the bottom jamb as a build-up can prevent the door closing snugly and giving you optimum draughtproofing.


Please ensure that this whole leaflet is read by the person fitting your Petflap.

Make sure that the Petflap is the right product for you before fitting. Make sure your pet fits through and that the product has not sustained any damage in transit or unpacking. Push open the flap by hand a few times. Please make sure you’re happy with the closing action and the lock.

It’s vital to ensure that the hole cut in glass is the right size first time. The hole for the Petflap needs about 2mm of play in order not to pressurize the glass unduly or to place pressure on the Petflap’s pivot.

Using the fitting ring as a template and cutting on the wide side, as instructed in the leaflet, should ensure this play is present, but we ask you to double check to avoid inconvenience.

We take no liability for consequential costs or damage arising from faults or faulty fitting. If your glazier has any doubts or concerns whatsoever, they are welcome to contact us on

The office is manned from 9.30am-5pm Monday to Friday.