Qwik Valve (where I ordered my Fumoto valves from) sells a F-Clip that's supposed to keep the lever secure:
http://www.qwikvalve.com/5-8-Safety-Clip.html
I paid for these but they weren't included with my order, so I'm waiting for customer service to send them to me.
http://www.qwikvalve.com/5-8-Safety-Clip.html
I paid for these but they weren't included with my order, so I'm waiting for customer service to send them to me.