Strain Relief Bushing for Sprinkler Wiring Side

My sprinkler wiring comes directly into the outdoor box (not through conduit) and I would like to get a strain relief bushing to seal the box up a bit. I ordered the recommended bushing for the electrical side that works great, but am having trouble sourcing the correct size for the sprinkler wiring side. Does anyone have any recommendations?

I bought these on Amazon to run the shielded twisted pair from a PVC box to my Rachio controller. Good price for a wide assortment of IP68 rated strain reliefs…

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