The patented rod locking system is found in all Accurate Retractable Coupon Holders. When the Coupon is placed at the desired depth and alignment then the locking screw is tightened. It securely locks the Coupon and insertion rod in place to 10,000 psi. Insertion rod diameters can be reduced which allows hand insertion of Coupons to 1,000 psi.
Accurate Retractable Coupon Holders for high pressure service (above 1,000 psi) require a retractor tool to insert and remove the Coupon. The special Retractor Tool weighs less than 20 pounds and can insert and remove Coupons to 10,000 psi. The special Retractor Tool requires little clearance because it is non-telescoping. Therefore, it can fit into those hard-to-reach places.