A launching cup has a horseshoe-shaped segment with a right and a left extension, each extension having a hole, and a pin can be inserted through the holes in the extensions to thereby prevent the launching cup from shaking or otherwise falling off the muzzle of the firearm. At least one of the receptacle side walls comprise a slide opening having opposing sides. The water-based composition can also contain a solution of an acrylic polymer of low molecular weight that is less than approximately 20,000, with a high acid value, neutralized to a pH of between 7 and 8. Advancing or retracting the semi-rigid rod within the flexible tube allows the operator to vary the stiffness of the transesophageal probe. The bent portion is between the first free end and the first connecting end. The plumbing apparatus may include at least one of a faucet or a hose assembly.