Grav Labs - Ground Joint Clamp

This ground joint clamp from Grav Labs is made of durable acrylic and is designed to secure your glass-on-glass parts together at the joint in order to avoid easily-preventable accidents. Try using one to secure any two parts together more permanently, or use to secure your downstem to your tube's joint to keep it from moving around when you lift your slide bowl during a hit! Choose from a 14.5mm, 18.8mm or 29.9mm joint size when ordering.