One used 5,000 Liter (approx. 1,300 Gal), 316 stainless steel Mueller reactor with propellor mixer. Max WP 50 PSI at 250 degrees. Jacket Rated 90 PSI at 250 deg. F., 3" center bottom discharge (no valve), made in 1983. S/N P7684-2. National Board # 9337, built 1983. S/N P7684-1. National Board 9336.