Save on the Irritrol R100P1 1" Repair Kit, which comes from the 100 Series (Century Plus). This repair kit is designed to be used with 1" 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. 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.