Do-It-Yourself Crystal Fire Plus Square Gas Burner Kit - Block/Paver Application - 42" Square Burner Kit. Take the guesswork out of your DIY project with these convenient burner kits. Each kit includes everything you need for building the perfect fire pit. Just add brick pavers or other construction materials to make it your own! The kits feature a Crystal Fire® Plus burner insert - the best on the market. Special order - contact us for a quote.