Irritrol's R100P3 3" Repair Kit comes from the 100 Series (Century Plus). This repair kit is designed to be used with 3" 100 Series Valves, and comes with: a diaphragm assembly, o-rings, metering rod, and fastening nuts. 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.