Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
I'm not sure this is at all helpful as I'm not familiar with the model you linked, but I've been using this for the past 3 years: http://www.lowes.com/pd_55986-53393-51142_4294612661%2B4294796166__?productId=3606942&Ns=p_product_qty_sales_dollar|1&pl=1¤tURL=%3FNs%3Dp_product_qty_sales_dollar|1&facetInfo=Light-dutyI think it has only been turned off once when we moved shops...
Use a waterproof wall switch if thats possible.