Do Raypak heaters come with flexible weatherproof gas line connectors? Asking because our quote to get the heater hooked up to a gas line was pretty high on its own, but the plumber asked if the heater came with such a flexible fitting to hook up the gas to? He said that if it didn't, it would cost a sizable sum to order one (about half of the low figure of the install quote). I know these are usually used on appliances, but on pool heaters? I had assumed it would be hard piped in with a union for easy disconnection?