Sidewall Green House Ventilation












                      Manual roll up/down ventilation for side wall plastic film

                      Rotate the handle simply on hand 

                      Roll up/down from one end to the other end 

                      Unique self-locking device makes it safe 

                      Rollup/down operation stops at any desired position simply by releasing the handle    (Ratchet type winches can be dangerous when used in the down motion) 

                      Metallic gears and its dust proof structure make it durable


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