I just got back from lowes and bought the t101 spst intermatic timer for my pool. We are going to wire it in and install it indoors next to the breaker box. Someone from "intermatic" told me I needed the t101R???? if putting it outside, but I reminded him of our hanging it indoors, which I hope is the right thing to do. I can't imagine NOT having a timer on the pump and going outside all the time. I bought 2 extra trippers so that I can split the 10-12 hours up in the morning and evening. Are you liking your t101 model and is it suiting your purpose? I am having my ABOVE ground installed beginning this wed. Wish me luck