4PCS Ex Air Vent Plug Breather Automotive Vent Filter Parts with PTFE Porous Film Internal Pressure Adjustment of Automotive ECU Case,Lamp,Motor,Lighting Equipment - Z Series 10.5-11.5mm The Hole Diameter is 10.5mm-11.5mm(The Opening Size is 10.5-11.5mm) Excellent features such as cold resistance and heat resistance Perform excellent waterproof and air permeability due to the membrane with micro pore By oleophobic performance, it is able to prevent penetration of window washer liquid and automotive related oil By excellent durability, it's suitable for internal pressure adjustment of automotive ECU,Lamp,Motor,Lighting Equipment. It is possible to install in any direction with “one touch” easy installation method.