Continue shopping “Pentair ETI400 Heat Pump Water Bypass Assembly 475621” has been added to your cart. Product Price Quantity Total × Pentair ETI400 Heat Pump Stack Flue Sensor 475601 $57.99 Pentair ETI400 Heat Pump Stack Flue Sensor 475601 quantity $57.99 × Pentair ETI400 Heat Pump Water Bypass Assembly 475621 $37.99 Pentair ETI400 Heat Pump Water Bypass Assembly 475621 quantity $37.99 Cart totals Subtotal $95.98 Total $95.98 Proceed to checkout — OR — Coupon: