Marketing InformationThis kit allows common cast iron shower drains (i.e. FRANK PATTERN INSTANT-SET, EZ TEST, OATEY-151 and others) to adapted to StyleDrain® drain throat upgrade kit (9178-UG-2 and 9190-A-UG-2). Once the upgrade kit is installed, any one of California Faucets® decorative StyleDrain® trim grids may be installed. The cast iron drain is commonly used in shower construction within the state of California because of temperature of hot tar waterproofing. PVC and ABS plastic drains cannot withstand the high temperature 500 deg F of hot tar. The ''Hot Mop'' method of shower waterproofing has been used in California for many years due to the ease of installation, reliability and economic value.