The 310W, 340W, 350W pumps are no longer available and have been replaced by the corresponding 310S, 340S, 350S sleeved plunger pumps.
The 310W series pumps were built with a special W770 alloy manifold that offered extended life in hard water conditions. Through our continued testing, we have found the new 310S plunger pumps, fitted with precision, press-fit, stainless steel sleeves in both the seal and valve chambers provide even greater extended pump life in difficult hard water conditions. The 310S stainless steel sleeved pump is more resistant to wear as high velocity water passes through the manifold chambers.
The 310W and 310S series use common Seal and Valve kits and individual parts. For extended life with difficult water conditions upgrade your 310W pump with a 310S Complete Head PN 816551. The 310S series pumps also feature the same Lifetime Warranty on the original manifold head as the 5CP2120W pumps.
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