Please note that Fairview has discontinued gas orifice fittings and gauging drill bits. They are selling off what is still in their inventories until they are depleted. We do not have another vendor to purchase these SKU's from in the meantime but we can direct you to the original vendor that sold Fairview their product if this is helpful in any way.
Please visit Anderson & Forrester for more details regarding gas fittings and drill bits.
Click this link to view a helpful CGA gas fitting reference chart