Got an old Thermarest inflatable camp mattress. Queen Size? Has two sides. There is a slow leak, could be the valve could be a pinhole somewhere. I don’t want to bother with soapy water test. The company sells patch kits or you can diy it yourself. You can also mail it in to them and they may fix it for 20. Either way, it’s on my front porch and yours if you want to find the leak.