automatic cylinder drain valve
automatic fuel drain valve
drain valve
排放阀
排气阀
排泄阀
排出阀
排液阀
排污阀
排水阀
排流阀
放泄阀
放水阀
疏水阀
疏水门
spiral case drain valve
pressure reducing valve reducing valve
valve disc type breath valve
A line used as both sterile and maintaining line
agonic line {agonic line of no declination}
Dual purpose line with nucleic male sterile line