9910.00.00

Materials for use in the manufacture of goods of Section XVI, of Chapter 40, 73 or 90, or of heading 59.10 or 87.05 (excluding the motor vehicle chassis portion and parts thereof), such goods being used in the exploration, discovery, development, maintenance, testing, depletion or production of oil or natural gas wells up to and including the wellhead assembly or surface oil pumping unit.

Canada Tariff Code 9910.00.00 falls under HS subheading 991000. Goods classified here pay a general (MFN) duty rate of Free. Preferential rates, trade remedies and other duties can change what you actually pay.