Solid Stainless Steel Pet Tub. Made of 20 gauge 304 stainless steel for durability. Strong, durable and versatile. High back and sides protect against splashed and shaken water. The tub will have 3 port holes so you can use a 4" faucet or an 8" faucet. It comes with a stainless still plugs that matches the tub stainless so you can plug the port hole that is not being used. Vacuum Breaker: A vacuum breaker is required by most plumbing codes to prevent contamination of potable water. Prevent backflow contamination of the piping system. The faucet has a vacuum breaker which keeps it from sucking dirty or herbicide-polluted water through the hose back into the water supply if there’s a sudden drop in pressure. (This feature is required by code in some regions; check local regulations.) Prevents toxic or bacteria-laden water from entering a home’s water supply. This can occur if the hose is left in a puddle of water and a pump is suddenly shut off or a water main breaks, causing negative pressure in the line. The vacuum breaker allows air, but not water, to enter the faucet. Anti-Siphon: prevents unwanted chemical siphoning, if city water pressure drops to zero, and changes in elevation create negative pressure.