Postcard from Hawaiʻi – Valve A valve on a cattle tank along Mana Road Related Posts Hāpuʻu Postcard from Hawaiʻi - Tree Postcard from Hawaiʻi - Mauna Kea Stream Postcard from Hawaiʻi - Koa Share this:TweetWhatsAppEmail Author: Andrew An electrical engineer, amateur astronomer, and diver, living and working on the island of Hawaiʻi. View all posts by Andrew