Overflow to waste join has a ball joint to allow it to be used with many shapes of bath.
ENKI, W64, Traditional Exposed Bath Retainer Waste with Ball Chain Plug and Overflow, English Gold, Polished Brass Waste
Bristan W BATH12 C Bath Clicker Waste Slotted Chrome
Viva New Modern Combination Bath Clicker Waste Brushed Brass Design - CWB02/BB
ENKI, W59, Bath Filler Waste and Overflow, Bath Filler Mixer Tap, Temperature Control and Clicker Waste, Click Clack, Chrome