The Vacu/Trol® Water Aspirator is constructed of stainless steel and brass to prevent corrosion and rust. The upper section has a 3/8” NPT male thread faucet connector for water inlet. The Vacu/Trol® will evacuate 10 liters of air to less than 60 mm Hg in less than 6 minutes at 25 psi water pressure. The Vacu/Trol® Water Aspirator uses less water to create a vacuum than competitive products.