Either buy aplug or replace the whole assembly. If it were mine I would replace the whole assembly.Putting a plug in that hole is just another place for water to leak. I hate water leaks! James please fill out your signature. House rules.okay. i've already bought the barbs and hose I just didn't want do disconnect anything I shouldn't have. So just to be clear, once I disconnect the hose from the inlet, what will take place of the old equipment seen in the picture? will i need to buy something to plug that hole?
I've got a suggestion...do away with that restrictive inlet filter, get a large canister style, and use barb and clamps for hook ups. While you're at it, run another chunk of hose to the other side of the pump and feed it too.
I wouldn't use garden hose from the tank. Use a bigger hose on a hose barb like Russ was saying. Larger bulkhead is a good idea. The pump should draw water through the line without the tank pressure having to purge it. When you start it up run it with no hose connected.