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We confirm that we make the design of the launcher & receiver saddle according to combination of the tube weight, water filling weight and the maximum weight of the Pig. We have the eccentric lower reducer as the joint for the launcher, while the concentric reducer for the receiver. We install the anti-collision device on the fast-opening blind plate (patent no. : 03210870.2) of the receivers to avoid the damage of the plate or the instrument from hitting when cleaning. The receiver & launcher should keep the inner channel smooth and, without any bump to block the passing of the cleaning instrument. Also, the maximum size of bump in the joints shall not be more than 0.3 mm.