Inexpensive spider gasket adhesive

I need to replace the spider gasket in my Pentair TM-22 multiport valve.  I’ve seen in other posts that the spider gasket should be glued into place and the adhesive that you recommend.  However, your adhesive is $65 and the Loctite 401, 403, and 416 aren’t exactly inexpensive, either.  Plus none of them are readily available at my local Lowe’s or Home Depot.  Is there a common, inexpensive adhesive I can use instead?

We’d recommend an RTV silicone. We sell that product for much less than $65. Click Here to View the RTV Silicone