DOMETIC SEITZ S4 Hinged Window 550 x 550. S4 Hinged Opening Windows are a complete window system formotorhomes and caravans with telescopic hinges for convenient ventilation and built-in blackout roller blinds and fly screens. This outstanding insulation corresponds to construction standards forhomes. Security locking system prevents windows from being opened from the outside. Highly versatile: for wall thicknesses of 26-41mm.