Duct hole is 42mm (1.65 inch). Import high qualitiy thermostat and adjustable speed blower switch. Fitting : for 16mm water hose.2pcs x Tee and 2pcs straight fittings. 6pcs x 16-25cm hose clamps. All items will be checked before packing. All items are new and of high quality. We will reply you within 24 - 48 hours due to time difference. The item "Universal Octa Outlet Car Under Dash Heater Box 12V Copper Coil Truck Tractor 1x" is in sale since Tuesday, December 18, 2018. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Air Conditioning & Heat\Heater Parts". The seller is "fcdx1600" and is located in CN. This item can be shipped worldwide.