My roommate has a old Hayward DE3620 pool filter (about 9 years old). Whenever there is any kind of pressure built up from filtering it starts leaking pretty badly from the top assembly where the manual air relief valve is (after a backwash it does not leak for a bit until the filters start clogging up again). I started researching and see that it is replaceable for a decent price however there is a difference in the one that is currently on the filter and the ones that I see for sale. The one currently on the filter has what appears to be some sort of pressure relief valve inside the top which is where the water is leaking from along with a small screw type manual air relief. The replacements I see for sale do not appear to have this pressure relief valve (they only have the actual manual air relief valve).
Can anyone let me know if this replacement will work or any issues it would cause?
Are there other replacements I should be looking at?
Also it's model number looks more like its for a DE2420 but will this actually fit the DE3620?
Here is the replacement I am looking at:
Attached is a picture of the current filter top and where it is leaking from.
Thank you for your help!