This billet reservoir is perfect for Honda Civic EG owners who want to enhance the look and functionality of their engine bays. Use it when you're looking to replace the old, unappealing plastic reservoir on your EG's stock master cylinder. It's designed to fit neatly on top of the OEM master cylinder, no complex sizing issues here. Ideal for car enthusiasts who pay attention to details and want a more durable and stylish solution for their brake system.