Plastic air breather, 3/8" thread. Used in air pumps also known as compressor heads Its function is to release the pressure from the crankcase, making the operation of the head more efficient and prolonging its life. BUSINESS HOURS Monday to Friday from 9:00 am to 6:00 pm. SHIPPING POLICIES If you purchase the product before 1:00 pm, it will be shipped the same day. Otherwise, the shipment will be made the next day (if it is possible). SPECIAL DESIGNS AND FABRICATIONS Ask our executives about special fabrications. We have a machining and micro-machining workshop to make custom parts. We work with stainless steel, brass, aluminum, Teflon, etc.