Customized version of http://www.thingiverse.com/thing:1324986

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=1324986

Using the following options:

Inline_Connector = round
Size_B = 8
Size_A = 4
Size_A_barb_count = 4
Number_of_Size_B = 0
Number_of_Size_A = 3
junction_type = Y
Shoulder = 1
Hex_Size = 8
Wall_Thickness_B = 1
Wall_Thickness_A = 1
Size_B_barb_count = 3