Irritrol's RSCAP Cap/Disc/Spindle Assembly comes from the RainSensor Series. This assembly can be used universally with most rain/freeze sensors. 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.