I now know that an insulator will not only keep heat in but keep heat from being conducted in the first place So my solar still is almost 100% metal including the 2 valves. There is however 1 plastic pipe between the rain collector and the evaporator that is flexible. My solar still has several parts. It has a rain collector which has a pump in it and a pipe that starts 6 inches from the bottom. The pipe goes 6 feet up and then arches and goes back down 5 feet. Water can naturally go uphill a few inches but not 6 feet. This pipe leads to an evaporator and it has 2 valves. One is a shutoff valve near the top of the arch. The second one is a backflow preventing valve close to the evaporator(Why it is here when backflow is more commonly going to happen when water goes uphill I don't know). The sun heats up the metal surface of the evaporator which then heats up the water. This kills any microbes and leaves any dust behind since it is heat over a long period of time. It then goes up 5 feet in another pipe as a gas and goes into the condenser. This supposedly would separate atmospheric gases from water via difference in melting points and boiling points but it doesn't really, even of the nonpolar gases like O2 and N2. So the water still ends up being acidic from CO2 that naturally occurs in rainwater and is what causes rainwater to be acidic. After the condenser it goes into a spigot and then into a 10 gallon container. The rain collector is 6 feet tall and has a 10 ft radius. So the rain collector can hold 314.16 cubic feet or 2350.08 gallons. The evaporator is a truncated cone with a smaller radius of 5 ft, a larger radius of 10 ft, and a depth of 1 ft. This is 183.29 cubic feet or 1371.10 gallons. So the shutoff valve is there for when the evaporator is full(which it almost never would, even after a thunderstorm. But how would I know when it is full? Would I know when the flexible pipe starts bulging out near the evaporator? And if I turn the shut off valve off but the pump is still running would the flexible pipe start leaking in the rain collector causing no water to flow through the pipe even though the pump is working and there is water? And what if it is colder in the air and on the ground than the IR light from the sun is? Would the metal conduct cold or in other words be an insulator(since insulators keep hot things hot and cold things cold) and thus expand into a more parabolic shape causing the change in radius per inch of water to not be constant and eventually over years and years break causing metal shards to spread out like how glass breaks into shards? Now the metal that is used for all metal parts of the solar still is stainless steel which despite it being stainless, can in fact oxidize or rust(I have seen a black oxide on a stainless steel spoon which is likely Iron(II) Oxide). It just takes much longer for it to oxidize than chrome plated or galvanized steel. And what about the pressures? I know there would be a pressure of 2 PSI(if it is enough to pump your blood 6 feet than it is definitely enough to pump water up 6 feet) at the water pump and I know that depending on the volume of the evaporator that is water that the pressure against the water flow will vary and that the air will be pushed out because of pressure. I also know that if P2(the pressure against the water flow) > 2 PSI that the water won't flow because of too much pressure against it or it will do it at a very slow rate(Much like blood at a very high pressure taking longer to deliver oxygen to the tissues). But how will I know what P2 is without inserting a pressure gauge into the evaporator when there is the same volume all the time just with a different amount of it being air and a different amount of it being water and that varying over time?