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 quick drying with cod liver oil This value belongs to the extreme insulation category for maximum protection 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 Powered intake valve remains closed when system is under pressure System evacuation