Precision machined “metal to metal” sealing system. Positive action clamping locks align the cover to the base, forming a steam tight seal. Since the seal does not use gaskets, the cover can be easily opened and closed. Features a readable pressure gauge for accurate pressure control and an easy to read, 8 1/2” x 11” instruction and recipe book. Made of heavy cast aluminum. Not for use on glass/flat top ranges. For home use only, not for commercial or restaurant use.