NPT HERMS Coil Size 25' (10 gallon) - $200.00 50’ (15-50 gallon) - $225.00 $200.00 Qty: Add to Cart Product Specifications 25' x 3/8" or 50' x 1/2" 304 Stainless Steel Coils for NPT kettles include (2) fittings to attach the coil to the kettle