The Festool 452898 D 50 SV-ASD 50 V Y-Piece for Dust Extractors from ITS is a sleeve to allow two dust extraction hoses to be connected to a dust extractor. If, in your workshop, youve got a mitre saw and jigsaw working at the same time, you would only need one dust extractor. Suitable to work with the D50, D36 and D27 extractors, the connection piece has a blanking plug so that the flow pressure stays at a premium level. Important information For extractors that admit hazardous dust, simultaneous operation is not permitted.