I can’t begin to tell you how durable your suction regulators are. In one of the busiest Emergency Departments on the west coast, we put all of our equipment to the extreme. Funny you should contact me, as I have just come across three more plastic suction regulators where the gauges have failed and the knobs are difficult to turn. Basically garbage and worthless to us. I have been exchanging out these poor quality products with Boehringer’s regulators for years. I know I can be assured that Boehringer’s regulators are tough and will last. Buying your product brings an assurance that when our department puts it to the test and it passes, then it’s a product worth having.