Sand filter waste port question

[fsds123]

I bought a used Pentair SD40 sand filter off of craigslist and hooked it up to a 3/4 hp pump. It is now running but there is a small amount of water coming out of the waste port. I don't have anything hooked up to it yet to close it. Is that normal? I was just going to attach some pvc and a valve to close it, or is there a gasket leaking in the multivalve port?

If it is a gasket...(I don't see any gaskets listed for this multiport anywhere on the internet, nor at the pentair website, only the entire multiport assembly seems for sale)...any problem with just attaching a valve to keep it from leaking?

 

[duraleigh]

or is there a gasket leaking in the multivalve port?

Most likely. There is a gacket inside the valve called a spider gasket or wagonwhell. I'm surprised it doesn't show on the diagram.

The valve onto the waste port is a clever fix but perhaps replacing the spider gasket is better long term....it may fix some other issues as well.