This is the small gasket that fits around the connection between the control knobs and energy regulators on your hob. It helps to keep the knob fitting correctly. If you have a split part, then this is likely the replacement you need. Hob Control Knob Gasket 42380751
Fits Models: 33800723, 33800724, 33800588, 33800590, 33800591, 33800594, 33800616, 33800619, 33800620, 33800898, PLE64N, PLE64X, PL40AX, PL40AN, PL40AXGH, PL2230/3X, PL40ASX, PL40ASXGH, PL40ASN, PL40ASXMX.