Waste Oil Heater Forum - Your definitive source for burning waste oil for heat.
Fuel Delivery Styles => Pressure Nozzle => Topic started by: Russ on March 01, 2009, 09:36:52 pm
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From what I have found, the size is 9/16-24
Cheap place to get a tap:
http://www.wttool.com/product-exec/product_id/24787
Or ebay.