Irritrol's I-PRO400 4" Spray Head comes from the I-Pro Series. It has a 1/2" FNPT thread. It features a 4" pop-up height. It has a pressure rating of 20 - 50 PSI. This pop-up does not include nozzles, and must be purchased separately. Irritrol has made their name as a brand by selling and marketing exclusively to the professional installer, as a result their products are geared to be dependable and durable. Irrirtrol is now making their products available to you through our website. If you are looking for a product line that will last year in and year out, Irritrol is the brand for you.