Continue shopping “Pentair ETI400 Heat Pump Stack Flue Sensor 475601” has been added to your cart. Product Price Quantity Total × Clearview Sodium Carbonate pH Up Soda Ash 5lb. CVSA005 $21.99 Clearview Sodium Carbonate pH Up Soda Ash 5lb. CVSA005 quantity $21.99 × Pentair ETI400 Heat Pump Stack Flue Sensor 475601 $57.99 Pentair ETI400 Heat Pump Stack Flue Sensor 475601 quantity $57.99 Cart totals Subtotal $79.98 Total $79.98 Proceed to checkout — OR — Coupon: