HYDRANT CAPS WITH CHAINS 2 1/2″ PLASTIC HYDRANT CAP WITH CUSTOM CHAIN RETAINER AND 1 1/4″ PENTAGON NUT 4″ HYDRANT CAP w/CHAIN AND CUSTOM CHAIN RETAINER – 1 1/4″ PENTAGON NUT 4 1/2″ HYDRANT CAP w/CHAIN AND CUSTOM CHAIN RETAINER – 1 1/4″ PENTAGON NUT The Hydrant Caps are Heavy Duty, made with ABS plastic, and the custom chain retainer will not rust along with the chain thereby not impair removing the cap quickly.