Sand filter replacement help

I have a sta rite t210wf filter with a wc112-147 valve assembly. The bottom of the valve assembly (the hole where the tube coming up from the inside of the filter inserts) is cracked and broken off of the assembly.

I was wondering if I could just extend the tube a little higher so as it will make contact with the valve assembly or can I buy a replacement port or hole or whatever it’s called , or do I have to buy a hole new sand filter?