COIL SRVC OIL 3Z663/5Z021 Hotsy Pacific Sale! from $1,735.00 Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Oil Fired Coil Fits 3Z663/5Z021 Series Heavy-duty schedule 80 carbon steel pipe Best warranty in the industry Sized to water flow for maximum heat rise Wound specifically for oil and gas fired applications