Tube Stop O-Ring Support Washer ProLock product complies with the applicable sections of the latest edition of the Uniform Plumbing CodeĀ® and the International Plumbing CodeĀ®, including behindwall installations. Refer to the applicable code listings for the latest information. Collet Stainless Steel Teeth Grips Pipe ProLock product is manufactured in compliance with ASTM F877, CSA B1 37-5, and ASSE 1061. Water System Components and Materials which contact drinking applicable.