Annovi Reverberi / AR North America O-ring Kit AR2237 for RM Series pumps. This AR2237 kit contains 19 o rings for pumps with less than 2.5 GPM flow. More info here: http://www.shopetsonline.com/product-p/ar2237.htm
Annovi Reverberi / AR North America O-ring Kit AR2237 for RM Series pumps