Important Note: High Temperature Seals
Please note, we thought about getting the type of connection that does not need a tool to make the flat seal end on the steel tube. The "tool less" type of connection use 2 spanners/wrenches that screw the connection together and compress a silicone seal onto the Flexible steel tube.
However these types of connectors use a silicone seal o-ring which can get damaged easily. Also the silicone seals might not be rated to as high a temperature as the the High Temp washers we include, +350 Deg C.
If you don't think you need such a high temperature rating, please note the Evacuated tube collectors we sell have a Stagnation temperature of 270 Deg C. If your electricity goes off in August and the solar pump stops working for an hour or two, the system will stagnate and the Glycol/Water Mixture in the collector header can approach 270 C. The gaskets at the collector need to handle this type of temperature.