Click or scroll to zoom Tap or pinch to zoom GRAV® 19mm Male to 19mm Male Joint Adapter by GRAV $7.99 Clear - $7.99 Color Clear 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart GRAV® joint adapters change the gender of a joint, making water pipes compatible with different accessories. This adapter changes a 19mm female joint into a 19mm male joint.