New valve door is 38% smaller. Measures just 4.4 x 6.3″ (11.2 x 16.0cm) Improved rubber door seal ensures optimum suction throughout the system. Improved hose-locking system is smoother and more efficient. Improved on/off switch is simpler and more reliable. Solves installation on thicker walls. Curve in tubing allows adjustment for wall thickness up to 1.5″ HS5000 Installation Guide
