Your Shopping Cart Continue shopping “The Marine Guardian High Water Sensor” has been added to your cart. Item Your Options Quantity Price Thetford AquaMax® Holding Tank Treatment - 1 Gallon - Spring Shower Scent Thetford AquaMax® Holding Tank Treatment - 1 Gallon - Spring Shower Scent quantity $37.65 × The Marine Guardian High Water Sensor The Marine Guardian High Water Sensor quantity $99.00 × Coupon: Apply coupon Update cart Continue Shopping Cart totals Subtotal $136.65 Sales Tax $8.20 Total $144.85 Proceed to checkout