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In all my reading i stumbled across a post for someone that had a garden nozzel with a thumb lever but it had broken.  i cam across one today. Just thought i would pass the info along.

i found it at truevalue

Greenthumb

thumb control nozzel $10.99

https://store.strasser-hardware.com/inet/storefront/store.php?mode=showproductdetail&product=-1&link_id=-1&link_itemcode=131070&category=&department=40&class=L22&fineline=L2212