It's a clipex strainer so ~75mm wide I think. Will that bond hold good for years or will it degrade with cold / water etc?
Jings - skinny!! (never worked with Clipex - was just thinking the metal gate posts we have used before).
75mm... Dig a hole 12inch dia, and go down to the rock. Itl never shift, and as @Lincs Lass says itl last forever.