Wholesale Knock Knock Broken Piston Phone Case | Funny Mechanic Car Guy Gift

In engine diagnostics, a knock is never a good sign - it means something is moving that shouldn't be, usually at high speed and under load. Mechanics hear that sound and already know before the hood is open. The pun works because it requires that knowledge to fully appreciate it: anyone who has diagnosed an engine knock knows exactly what kind of conversation the piston is trying to start. Also check out: Car Guy T-Shirts | More Car Phone Cases * Case: Dual-layer tough construction - polycarbonate outer shell, flexible TPU inner lining * Protection: Raised bezel protects screen and camera when face-down | All ports and buttons fully accessible | Wireless charging compatible * Print: Printed directly on the case - not a sticker. Won't peel, crack, or fade * Ships from the USA. US 3-5 days. UK 3-6 days. EU 4-8 days. Australia 3-7 days. Rest of the world 12-20 days.