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This hyperlink has 8 Types Stepless Thermostats, A,B,C,D,E,F,G,H, the price is the same, the picture in the detail section will introduce the difference, please choose the best in maintaining together with your need. If you order, please be aware whether or not you need it. If you don't make a note, it will deliver two Stepless Thermostat via means of default!!! How to establish which air pressure swap you need. Please eliminate the outdated swap and measure the dimensions of the mounting hole. If the diameter is five cm and the switch has only 2 wires, you may want 1000w round or 1200w. If the previous swap is 3 or four wires, Then we need to evaluate the size of the mounting gap with the scale of the electrical board in the back of our switch, after which it can be installed in it. Then investigate the wiring diagram in the details, and you may take an image once you can understand the wiring diagram or seek the advice of us.