The LockDry device from LockDown can be installed in a few minutes by one person without special tools and can be easily removed for unobstructed access to the manhole. It helps eliminate inflow of unwanted water and debris. The device can withstand extreme temperatures and heavy loads. A neoprene gasket creates a watertight seal. No modifications are needed for the manhole frame or ring. The device is corrosion- and tamper-resistant. 866/399-2512; www.lockdowninc.com.