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SIZE GUIDE
NZ
US
EU
Internal Diameter (mm)
F
2.75
43.5
13.9
F 1/2
3
44
14.1
G
3.25
45
14.3
G 1/2
3.5
45.5
14.5
H
3.75
46
14.7
H 1/2
4
47
14.9
I
4.25
47.5
15.1
I 1/2
4.5
48
15.3
J
4.75
48.5
15.5
J 1/2
5
49
15.7
K
5.25
50
15.9
K 1/2
5.5
50.5
16.1
L
5.75
51
16.3
L 1/2
6
52
16.5
M
6.25
52.5
16.7
M 1/2
6.5
53
16.9
N
6.75
53.5
17.1
N 1/2
7
54
17.3
O
7.25
55
17.5
O 1/2
7.5
55.5
17.7
P
7.75
56
17.9
P 1/2
8
57
18.1
Q
8.25
57.5
18.3
Q 1/2
8.5
58
18.5
R
8.75
59
18.8
R 1/2
9
59.5
19
S
9.25
60
19.2
S 1/2
9.5
61
19.4
T
9.75
61.5
19.6
T 1/2
10
62
19.8
U
10.25
62.5
20
U 1/2
10.5
63
20.2
V
10.75
64
20.4
V 1/2
11
64.5
20.6
W
11.25
65
20.8
W 1/2
11.5
66
21
X
11.75
66.5
21.2
X 1/2
12
67
21.4
Y
12.25
67.5
21.6
Z
12.5
68
21.8
Z 1/2
12.75
69
22
Z+1
13.25
70.5
22.4
Z+2
13.5
71
22.6
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