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1` ' , <br /> ' EXHIBIT B <br /> or tightening effect, and so designed that failure from overtightening of the nut results in threads <br /> stripping rather than stem fracture. There shall be no evidence of staking or chisel marks on the <br /> nut after assembly. Each corporation stop shall be tested by the manufacturer with not less than <br /> 85 psi. air pressure with the stop submerged in water in both the open and closed positions. No <br /> top, bottom, or port leaks are permitted. <br /> 3. WATER TAPS. Water main taps shall be not less than 3/4 inch and any tap larger <br /> than one inch normal size shall be made by means of attaching to the main a bronze service <br /> saddle provided with an integral service outlet accurately machined and pre-tapped by the <br /> manufacturer to receive a full-sized corporation stop of equal size to the service line. The <br /> service saddle shall be of the double strap type with body and nuts cast of ASTM B62 bronze; <br /> straps shall be silicon bronze with rolled threads, shall be accurately curved to conform to the <br /> main, and shall be flattened to provide large bearing surfaces. The outlet portion of the body <br /> shall be encircled with an O-ring type pressure seal cemented and confined in a corresponding <br /> groove on the inside of the body. The pressure tap for services larger than one inch shall be <br /> made by drilling through the corporation stop in the fully open position, using the proper type <br /> drilling machine and attachments and using the maximum possible drill size for the corporation <br /> stop. <br /> 4. WATER SERVICE - CORPORATION STOPS. The corporation stop shall be <br /> protected by a box construction with clean whole brick placed on a solid bottom extending not <br /> less than two feet six inches from the main with brick joints overlapping and with a brick cover <br /> providing at least four inches of clearance above the stop so that there shall be no weight thereon <br /> in case of settling. <br />