Double Glazing South Gower. Manufacturers and Installers of uPVC, Aluminium, Composite Doors, Windows and all types of Double Glazing in South Gower. uPVC Windows, Doors & Conservatories in Gower SA3 Swansea and South Wales. We are MPN Windows and cover the whole of South & Mid Wales and provide quality products at the very best of value quality affordable prices.