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Diaphone Jim · 04-17-2019, 12:03 PM

The arrow is the manufacturer's logo.
Though there are other theories, I think the second valve is for the inner safety tube:
http://sporttoday.org/9_7e4d61ce7762e244_1.htm

04-17-2019, 12:03 PM	#11
Diaphone Jim Junior Master Dwellar Join Date: Sep 2007 Location: Northern California Posts: 2,122	The arrow is the manufacturer's logo. Though there are other theories, I think the second valve is for the inner safety tube: http://sporttoday.org/9_7e4d61ce7762e244_1.htm