Water Helmet cost

Any ball park idea of how much Water Helmet cost?
I googled it and found a big range from $9 to $20 per linear ft.
I have about 180 ft..... the is a cost range of ~$1,700 to $3,600....
Thanks! mac
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Mac said:

WTH is a 'water helmet'? Is it anything like a henway?
[...]
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