Cap of 1st test cock of backflow preventer is leaking

[LilyT]

I have a Febco 850 backflow preventer unit. Water sprays out under the cap of the 1st test cock. My cap is not metal. It is made of black plastic attached with a rubber band, one end is a small loop as a washer for the cap, the other end is a large loop to loosely connect to the collar. A 7/16” wrench can fit the cap to turn it. I have attached the picture of my unit below. I wonder if a new set of rubber band and cap might fix the leaking problem. Do you know where I can get this replacement part? Thanks a lot!

 

[Geofd]

Those are supposed to be closed ,if the screwdriver stop us in the vertical position it's open, if it's horizontal and spraying change it, I think it's an 1/8th inch tapping, I usually change them out to a male ips ball valve

 

[LilyT]

Those are supposed to be closed ,if the screwdriver stop us in the vertical position it's open, if it's horizontal and spraying change it, I think it's an 1/8th inch tapping, I usually change them out to a male ips ball valve

You’re right! The winterization crew didn’t fully close the test cock. After I turned it horizontal, the spraying stopped. Thanks so much for the accurate diagnosis!