1. All of the plaintiffs' claims are dismissed.

2. The costs of lawsuit are assessed against the plaintiffs.

1. Basic facts

A. On September 2013, the Plaintiffs contracted a new construction of Gyeonggi-si D ground housing (hereinafter “instant housing”) with C, and performed the said construction, and installed XL pipe (hereinafter “instant pipe”) manufactured by the Defendant around October of the same year for heating of the instant housing.

B. The construction of the instant housing was completed on or around December 2013 by the Corporation, and C obtained approval for the use of the instant housing on March 13, 2014.

C. From June 2014, water leakage occurred in the pipe of this case constructed in the instant housing from around June 2014, and C and the Plaintiffs were paid several times, but the number still occurs.

[Ground of recognition] A without dispute, Gap evidence 1, 2, Eul evidence 7, witness C's partial testimony, part of the party's question of plaintiff A, the purport of the whole pleadings

2. The plaintiffs asserted that water leakage occurred in the housing of this case due to the manufacturing defect of the pipe manufactured by the defendant, and as the owner of the housing of this case, C or the constructor, the owner of the housing of this case, suffered damages of KRW 32,105,830 in all the costs of removing the pipe of this case and rebuilding the pipe of this case, KRW 1,320,000 in costs of removing and rebuilding the pipe of this case, KRW 4.5 million in costs of moving due to heating pipe reconstruction, KRW 1 million in costs of rebuilding due to heating pipe reconstruction, KRW 1,00,00 in monthly rent for residing in other places during the reconstruction period, KRW 20,00 in total, KRW 39,925,830 in costs of water leakage, KRW 80,00 in total.

Therefore, the defendant is liable to compensate C or the plaintiffs for the above damages. Since the plaintiffs acquired the above damage claim against C's defendant, the defendant is ultimately liable to compensate the plaintiffs for the above damage.

3. Determination

(a) in order to impose liability on the manufacturer for damages on the manufacturer for reasons of defects in products produced in large quantities due to the concentration of highly advanced technology;