If you’ve ever had to blow down your steam boiler (and I am sure you have), you know how nasty that boiler water can get. That’s what happens to water in an iron system that is open to the atmosphere. So just imagine all of the gunk that accumulates over the years in all of your returns that are below the waterline. Eventually, they will fill up with sediment and prevent the condensate from returning to the boiler and now we have a big problem. The simple solution is to flush out those wet returns annually and all will be well. Except that in most cases you can’t. Because boiler drains were never installed on the elbows to allow the flushing to take place. Rest assured, we install drains at every 90 degree elbow we install below the waterline. That’s premium workmanship