Is it possible to pop off this end cap?

So, I am looking to replace an anti-siphon sillcock. My wife and I recently moved in to our house and one of the outdoor houses leaks from the inside when we turn it on. From the outside of the house, I measured where the sillcock is relative to the bathroom window. Right where the sillcock should be from the inside of the house, there is this box that is connected to a sewer vent. Is it possible to pop off the threaded end cap there? If so, I think I could just pop out that plastic box. I think that if I can remove this box that I can see how the sillcock is connected to the inside pipes and determine if it is a job I can do myself. Thoughts? Thanks in advance. I am relatively new to these types of home repairs.

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