On a small plate, combine kosher salt and chili powder. Use a lime wedge to wet the rim of the glass, then dip in chili salt mixture.
Depending on what spice level you're looking for, toss 1-3 jalapenõ rings in the bottom of the glass and muddle with a wooden spoon. Fill cup with ice.
In a cocktail shaker, combine ice, tequila, triple sec, and pineapple juice and shake until well combined. Pour into glass and top with mango seltzer water to taste.
Garnish with pineapple and lime. Enjoy!