Found the Xterra part number: 15241-43U0A.
It's a check it's function, then if needed, replace the item. For this part, that circled X means if you remove this valve, don't put the old valve back in, put in a new valve since removal likely damaged the old part.
Relief Valve
Check relief valve for movement, cracks and breaks by pushing the ball. If replacement is necessary, remove relief valve by prying it out using a suitable tool. Install a new relief valve in place by tapping it in.
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It's a check it's function, then if needed, replace the item. For this part, that circled X means if you remove this valve, don't put the old valve back in, put in a new valve since removal likely damaged the old part.
Relief Valve
Check relief valve for movement, cracks and breaks by pushing the ball. If replacement is necessary, remove relief valve by prying it out using a suitable tool. Install a new relief valve in place by tapping it in.
