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Here's a guide for you to identify which tube and nozzel is suitable for your Husqvarna blower. The table shows which tubes are connected to each other. for example the base tube is connected to your blower and connecting tube one and two will attached on to that. (see diagram below)

Difference between a nozzel and a tube

Some blowers allow you to make a choice between having a tube or a flat nozzel. By having a smaller flat nozzel compared to a larger round tube you will get more MPH (miles per hour) from you blower. MPH measures how fast the air escapes your blower. By choosing a flat nozzel over a tube you get more MPH but will lose out on CFM (cubic feet per minute) which gives less of an air flow size.

Summary:

Flat Nozzel - Higher MPH / Lower CFM

Round Tube - Lower MPH / Higher CFM

Blower Model	Base Tube	Connecting Tube 1	Connecting Tube 2	Nozzel
125B	545 14 02 01 545 14 02 01	545 11 80 01		545 11 95 01
125BT		531 00 37 91	531 00 37 92
125BVX	590 56 92 01 590 56 92 01	545 11 80 01		545 11 95 01
125BX	545 14 02 01	545 11 80 01		545 11 95 01
130BT, 530BT	504 06 48 01	504 06 47 01	504 06 46 01	502 44 40 01
132HBV	530 06 92 70	530 09 44 76
140B, 141B	531 00 32 16	531 00 32 17
150BF, 150BT	504 06 48 01	504 06 47 01	504 06 46 01
155B		531 00 32 16	531 00 32 17	531 00 44 84
170BF, 170BT, 370BFS, 370BTS	505 18 11 01	511 76 82 01	511 80 63 01
180BF, 180BT, 380BFS, 380BTS	505 18 11 01	511 76 82 01	505 18 13 01	544 27 48 01
350BT				502 44 40 01
356BF, 356BT	537 42 27 01	537 03 89 01	537 03 90 01	537 28 21 01
436LiB	584 15 66 01	584 15 68 02		586 10 63 01 586 10 63 02 589 81 17 01 579 79 75 01
525BX	585 62 59 01 585 62 59 01	585 62 62 01		585 89 73 01
530iBX	584 15 66 02	589 81 17 01	586 10 63 01 586 10 63 02 589 81 17 01	579 79 75 01
536LiB	584 15 66 01	586 10 63 01	586 10 63 02
536LiBX	584 15 66 01	586 10 63 02	586 10 63 01
570BFS, 570BTS	576 58 14 01 <	576 58 17 01	576 58 18 01	576 58 27 01
580BFS, 580BTS	576 58 14 01	576 58 17 01	576 58 64 01	576 58 27 01