Hi I am repumbing my inground pool and was wondering if I disconnect the pool drain and skimmer will the water drain?Reason is the valves and connectins need to be replaced and adding shut off valve and Jandy for better control of water system..Valve from the drain is metal and was never open anyway...If I cut the PVC to use another valve( which) I plan on using PVC this time will the pool drain?Dain is in deeper end of pool and don't know of anyway to cover if needed...Any ideas?Thank you so much for your help...Ray