At a rough guess, and it IS only a guess, it's a Murata NMF40R series 3 terminal capacitive feedthrough filter, part number MFE31PT222Z1E9L, Farnell order code 952-8172, Page 941 of book 1 of the 2007 catalogue.

Bottom left of the page.

smile

pca
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Experience is what you get just after it would have helped...