The air cum vacuum relief valve is made of an aluminum body. This safety valve help in avoiding possible damage to pipes and accessories. When the pipe is being filled, the air release valve remains open, expelling all the surplus air outside the installation and when the pipe is full of water, air release valve closes tightly. A simple design ensures trouble-free performance. The cast aluminum body combines the dual advantage of being lightweight with corrosion resistance; a synthetic rubber seal assures a positive rubber seal even with low head applications. If you have been looking for Automat 1.5 Inch (3.81 cm approx) Male Thread Aluminum Air Cum Vacuum Relief Valve HT-89, your search ends here, as you can get the best Automat 1.5 Inch Male Thread Aluminum Air Cum Vacuum Relief Valve HT-89 on our website.