Can 100 lb lp gas and 200 lb lp gas be connected?

Yes, 100 lb and 200 lb LP gas cylinders can be connected in a system, but it's important to ensure that the regulator and fittings are compatible with both sizes. The system should be designed to handle the different capacities safely, and proper regulations and guidelines for LP gas systems must be followed. It's advisable to consult a professional to ensure safe and effective installation.