Irritrol's 2709PR 1" Manual Anti-Siphon Valve comes from the 2700 Series. It has a 1" slip thread. The 2709PR has a flow rate of .25 - 30 GPM. It has a pressure rating of 10 - 150 PSI. 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. Irritrol 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.