Part #100108299, Water Heater Installation Kit / 6.20 x 4.50 x 2.00. This installation kit (part number 100108299) is for water heaters. Installation kit 100108299 contains all the parts to connect 3/4-inch water lines to the water heater. Disconnect electrical power to the water heater and turn off the water supply b... - Part #100108299, Water Heater Installation Kit / 6.20 x 4.50 x 2.00.