Tri Clover Compatible Clamp Nut – Red via Brewers HardwareMore Info
From the product description, check product page for current description, price and availability:
We brought these in to use with our line of Quick Clean ball valves, but they also work great in areas of your brewery where you want to highlight clamps that should be unclamped using caution.
Featuring a bright red nut that will make it easy to help prevent against accidents.
Second picture shows the nut on a clamped assembly, but only the nut is included. These nuts may not work on larger sized Tri Clover clamps due to the design, but shoot us an email or give us a call and we can verify if the nut will work with your clamps.
As of this posting, Brewers Hardware has these for just $1. Check product page for current price & availability.