This is a an after market Dyson V7 V8 V10 V11 V15 Outsize Extension Tube. 

Fits model V7 with serial numbers starting with V7 SV11 TM2 ZP9 B8U B3Z

Fits model V8 with serial numbers starting with SV10 SV10E RB1 RB2 VD5 YA3

Fits model V10 with serial numbers starting with SV12 ZS3 D8P ZS2

Fits model V11 with serial numbers starting with SV14 D2M F6A D2N D2P B9N

Fits model V15

Fits model Outsize

Supplying parts to Australia