Unique European gouge design, Adopted pressure and de-pressure principle. Three seals system can be selected and installed. Sound insulating, heatproofing, waterproofing and gas tightness performance is better.

• 独特的欧槽式设计，采用等压减压原理，可选配的内设三道密封系统，其隔音、隔热、防水、气密性能更佳。