1106 - 1/4" Air Line Filter/Regulator is an accessory designed for dependable use with Goat Pumps fluid-transfer equipment and compatible setups. Description:. This air regulator assembly with ¼” NPT inlet and outlet is ready to use and easy to install. It includes a 40-micron airline filter, nighttime drain for any water build-up, regulator gauge, ball valve, and quick connect fittings.