Propress copper connected to the Caleffi pump station and 80 gal. Wagner tank Published January 18, 2012 at 500 × 756 in Saco Solar Installation – Freeport, Maine Wagner Huch 80 gallon dual coil tank with air purger and Caleffi Solar Pump Station ready for final insulation and wire management. The copper pro-press fittings are impressive – too bad we end up hiding them.