The part appears to be source of minor coolant leak perhaps a new gasket required not sure what the function of the item is.
Looks like a mini flying saucer bolted onto the engine block about 40-50 mm diameter. When the engine coolant is under pressure it does not weep probably because the heat seal the gasket. However on run up to pressurisation and on the cool down cycle after engine turn off it weeps and runs down the Cat converter housing losing about 20 mL a time. 'Top Up Coolant' after a few weeks 100 mL required to do so. It is located on the RHS standing in front facing the engine underneath the Cat guard stamped on it 260TO5.
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Edited by Supercar, 31 May 2018 - 05:07 PM.