ExplainingNothinng on Instagram: "When a standard plunger fails to clear a stubborn obstruction deep within a drain line, you need a way to deliver a concentrated, high-velocity pressure wave without splashing back. This is the Pneumatic-Piston Displacement, a brilliant improvisation that uses a plastic bottle and a bicycle tube to create a professional-grade "pressure-jet" system. The critical step is the airtight kinetic seal. By cutting the bottom off a rigid plastic bottle and securing a sec