The 304 stainless steel and all-copper floor drains for submarines both perform the same core functions—odor prevention and water drainage—but differ primarily in durability, aesthetic appeal, price, and weight. Simply put: copper floor drains are more premium and durable, with a higher visual appeal; stainless steel offers better value, practicality, and long-lasting performance.

Core Difference Comparison
Material and Durability
Brass floor drain: integrally cast for greater heft and superior corrosion resistance; resistant to oxidation even in prolonged damp conditions, ensuring a longer service life of 10–20 years. The surface can easily be finished with electroplating, brushed, gunmetal, or other premium treatments, delivering a high-end texture and enhancing the overall aesthetic appeal.

304 Stainless Steel Floor Drain: Made from thickened 304 stainless steel, it offers excellent rust and corrosion resistance—more than sufficient for everyday use and easily lasting 10 years in a home setting. However, its texture and sense of heft don’t quite match those of copper.

Price
Copper floor drains: Expensive—typically 30%–50% more per unit than stainless steel.
Stainless steel floor drains: excellent value and the top choice for limited budgets.

Appearance and Style
Copper floor drains: Available in finishes such as bright chrome, matte brushed, gunmetal gray, and cream white, offering a sleek aesthetic and high-end decorative appeal—perfect for light-luxury, Nordic, or modern interior styles.
Stainless steel floor drains: typically finished in silver brushed or polished, offering a simple, practical, and versatile aesthetic, though the material feel is rather standard.

Weight and Installation
Copper floor drain: very heavy, made with solid materials, and resistant to deformation under foot traffic.
Stainless steel floor drains: lighter and easier to install.