I have a brand new 310T2 Hayward filter that leaks at the drain, Hayward sent a new cap saying the gasket was missing, still leaks. Is the unit bad or does Hayward have a design issue?

SOURCE: The threads are stripped on my Hayward sand filter drain plug.

I've had the same problem every year since I bought this house 10 years ago with my Hayward filter drain and finally MacGyvered a great solution. Went to Home Depot and bought a 1" PVC shutoff valve. The Hayward drain has an outside 1 1/4" thread. The part I got was an 'Aqua-Dynamic' 1" PVC Schedule 40(I can't find a picture of it on the internet). It is a white PVC valve with an inside thread that mates with the Hayward and a red shutoff winged knob. You need to hacksaw the red wings off the knob in order to be able to screw it onto the drain because the filter's base gets in the way. Leave the valve in the open position(especially if water is still draining with filter off) and put PVC cement on the outside of the drain thhreads and a bit on the inside of the valve and screw it on. When the glue dries(5 minutes), you now have a drain that you can open and close every year with ease(you need a pair of pliers because the wings are off the turn knob but it works great!)

SOURCE: My Hayward pump is leaking.

is the pump leaking from the lid if so you may have an obstruction **** as dirt leaves or debree if the pump is leaking where the motor meets the wet end of the pump then you need to replace the ps1000 seal not sure if ps1000 will work on hayward but when you go to buy one. tell the pool store employee that you need a ps seal for an hayward.

SOURCE: Waste line leaking

Bad gasket on diverter on the valve

SOURCE: Waste line leaking

take the top off the valve and lubricate the gasket if it is not damaged.if ti is you will have to replace it.

SOURCE: leak between seal plate and pump/strainer housing

The pump seal is leaking and needs replacing and requires removing four 3/8 bolts (9/16) wrench and removing the motor then the diffuser to get to the impeller and seal . A 7/16 wrench holds the rear motor shaft behind the springs and impeller spins off to reveal the seal which has two parts one on the impeller with a spring and one in the seal plate is white ceramic/ porcelan whatever they use. Part number is an SPX1600KA on super pumps and 1500KA wassome above grounds. When replacing do not touch the mating white and black surfaces with your fingers.