Should barrel be plural or singular. It is in front of a noun so it should be an adjective? Adjectives can't be pluralized?
How do I take apart the 2 barrels Washing machine?
How do I take apart the 2 barrel Washing machine?
"How do I take the two-barrel Washing machine apart?"
What does the product instructions call it? (Still, I suppose if you had that, you wouldn't need to ask how to take it apart)
PS: Don't they teach anymore that numbers up to ten should be written out in full? Just curious.