The retaining ring removes easily with the CodeLine key or with just a pair of pliers and a screwdriver. Replacing the retaining ring is easy too, since it snaps back into place with just finger pressure. CodeLine's exclusive Quick Lock system means you'll access membranes in seconds and- because time is money - enjoy big savings as well. Each A- and E-Series membrane housing will accommodate all standard membrane elements to give you unparalleled design flexibility. Every CodeLine membrane housing is subjected torigorous quality control and testing before it leaves the factory. While the vessels are built to ASME Section X Code specifications, the testing programm gratly exceeds Code requierments. CodeLine put every design through a staggering 250.000 cycles and then they test it to six times rated operating pressure. That's two-and-a-half times the cycles required by the ASME Code. All at no extra cost to you.