there is a flange that is 3 inches in diameter

PANEL-WRAPPER EHFA&EHFSA(R)

The walls with which the fastener is used must also be 2-1/2 inches to 3-1/2 inches thick

This ceiling-mounted support provides extra sturdiness to the curtain rod to ensure the integrity of its installation

Bradley S45-844 "Hfso" Hand&Foot Stay Replacement Part

Haws 8111FP Freeze Resistant AXION MSR Drench Shower w/ Plastic Shower Head Capacity-44 oz there is a flange thatHand Activation Wall Mount Full Body Coverage Area 1" IPS Supply Inlet Meets ANSI Standard Z358. 1 The HAWS model 8111FP is a freeze protected, wall mounted drench shower with AXION MSR ABS plastic showerhead. The unit also includes flow control for the showerhead, a brass stay open ball valve with stem and stem extension for maximum wall thickness, a stainless steel push flag, and a universal sign. From the Manufacturer: Model 8111FP AXION MSR freeze