If after the sprinklers work is finished, thimble a timely bomb Replies bit, there will be a water column flux outflow. Very close from the warm-up, there will be a security risk. The reason: inside the nozzle, the friction of the rubber ring with the inside of the the thimble site at relatively large thimble return more slowly under the action of the spring! Thimble site a rubber band on branded butter on the line.