Air Relief Valve 3 4 inch Air and Vacuum Relief in The Irrigation Water Saving Agriculture Drip Irrigation System Protected Outlet 1 Pcs industrial_best_sellers_Jan2025 with cod liver oil healthJAPAN_March2024 with cod liver oil With internal dimensions of 148 x 30 x 64 mm The power type fast inlet and exhaust port opens and air enters the air valve to avoid the formation of negative vacuum pressure in the system Reduces maintenance requirements and extend drip system life Smooth and reliable operation Eliminates air pockets within a system zone Releases air from the drip line when the zone is turned on Allow air to freely enter the system when the zone is shut down Ball float design offers perfect sealing under very low system pressure Easy to handle and maintain Constructed of UV resistant Gas dynamics valve design and float anti blow up design can prevent the float from being blown up by high speed airflow before the water enters the air valve