I just replaced a set of 1" valves and was surpised to find expansion (telescoping) fittings connected on the output side of the valves. This actually simplified a lot of the work to change the values out. I had to extend the telescopes to fit my new vavles, but it was relatively easy with some 2" lengths of PVC and a standard coupler. I've been doing some research, and I haven't seen anyone recommend this type of setup. I'm worried that this is actually a bad design. From what I can tell, the telescope fittngs will put a lot of lateral pressure on the PVC line and valves when it is pressurized. Can anyone tell me if this is OK to leave as is, or should I try to "fix" it. So far the new valves are working really well and I imagine the system has been running for 10 years or more with the original valves that were replaced ... so more curious about this type of design, and how common it is. Thanks.