DN20BX-2 plastic float valve is the self lock(autolock) valve.
It can be used on the water tank, evaporative cooler, livestock&poultry,
cistern tank, aquariums, gardening, etc.
The valve is green and will not get rust.
This DN20BX can be both horizontal and vertical installed;
And the nut on the arm can be adjusted to set the target water level.