My Hayward DE 4800 backwash valve needs replacing. From searching the net I believe Hayward SP0410X502S is the part # for this filter. There are quite a few negative reviews on this valve, mostly stating the steel slide in the valve fails due to substandard material for the environment(rusts within a few months then begins leaking). The valve with the slide is about $120 or the slide alone is $90, makes sense to get the complete unit. Is there an alternative, does anyone have experience(good or bad) with this valve? thanks, Brian