DOMETIC SEITZ S4 Sliding Window 500 x 450. S4 Sliding Opening Windows Perfect for caravans, motorhomes and even horsebox conversions the Dometic Seitz S4 sliding window is easy to install, simple to use and provide superb thermal insulation to block any wayward cold. Featuring double glazed panes, the Seitz S4 sliding windows also come complete with an easy action integrated roller blind and fly net that can be conveniently moved into various positions, providing you with optimum control over light exposure or pests. A safety catch provides tremendous added security to the window preventing it from being opened from the outside. The Seitz S4 sliding window is quick and easy to install and is available in a range of sizes to suit your needs.