The Irritrol R811-24VACG Replacement Solenoid Assembly comes from the Irritrol Parts Series. This solenoid is for use with most 24V AC controllers. 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.