Item #	Tube Size	Orifice	Tube A Size
N-FF-4	1/4 in	0.73 in	1 in
N-FF-6	3/8 in	0.85 in	1.01 in
N-FF-8	1/2 in	1 in	1.09 in
N-FF-12	3/4 in	1.32 in	1.25 in
N-FF-16	1 in	1.7 in	1.52 in