Durable Oxygen Tank Knob: This knob is 3D printed in the USA using high-quality materials for long-lasting performance. Made in USA, 1 year warranty Ergonomic Design: Features an ergonomic shape for a comfortable and secure grip. Universal Compatibility: Designed to fit most standard oxygen tanks for versatile use. Compact and Portable: Lightweight and compact, making it convenient for travel or on-the-go use.