Continue shopping “R172283 Pentair Rainbow 300 and 320 Pool Chlorinator 20 inch Extension” has been added to your cart. Product Price Quantity Total × 551236 AquaChek Silver 7-Way Test Strips (2 Count) $35.66 551236 AquaChek Silver 7-Way Test Strips (2 Count) quantity $35.66 × R172283 Pentair Rainbow 300 and 320 Pool Chlorinator 20 inch Extension $47.55 R172283 Pentair Rainbow 300 and 320 Pool Chlorinator 20 inch Extension quantity $47.55 Cart totals Subtotal $83.21 Shipping Shipping costs will be calculated once you have provided your address. Total $83.21 Proceed to checkout — OR — Calculate shipping Country / region: Select a country / region… United States (US) State / County: City: Postcode / ZIP: Update