I have installed 4" PVC straight through after the connection in my basement. I used 4" PVC to hopefully avoid having to use any type of fan. (Passive venting) I am looking for something to cap the top of the pipe but read not to use anything in climates that have cool winters...Zone 5 here. Is there a good product to use? I fear leaving the 4" pipe exposed will allow varmits to get in and fall down and die...but also allow rainwater to easily enter to the soil below my basement concrete. It's not a sump pump, so there is no way for the excess moisture to escape besides evaporation. (walkout basement with sloped lot, so sump pump was not needed).