The PXA4231 from Everhot is a 1" PEX Bend Support with Ear.  This item is commonly used to stub out of the walls. Just lock the tube inside the bend and the installation is complete.

Features:

• 1” PEX Bend Supports can also be used with 3/4” PEX tubing;
• Drop Ear allows fastening of the bend support to stud or wooden surfaces;
• Fiber-reinforced nylon material makes for higher holding power and extra durability;
• Lower pressure drop when compared to a regular PEX elbow;
• Cheaper and more efficient than a PEX fitting with rings.