Cap has a tab style, non-threaded type twist lock to assure a good seal to your water fill. Strap is heavy duty plastic which holds up to the UV rays and weather better than most rubber styles.

 PROP 65 WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For more information, visit www.P65Warnings.ca.gov