http://tinyurl.com/n5vto5y
Guardian Drain Lock Hybrid Floor Sink Drain Lock
Prevents Damage to P-Traps from Cabling
Prevents Clogs and Decreased Plumbing Expenses
Cuts Down On Solid Waste
Prevents Floating rags/bags from Blocking Pipes
A #40 Tamper Proof Torx bit for 2" or #45 for 3" can unlock your Drain Lock (Torx Bit Sold Separately)