Fernco Flexible 1-1/2 In. PVC DWV Elbow Pipe Fittings The primary difference is that

The primary difference is that hard water minerals are replaced with potassium instead of sodium

manufacturing

It is an ideal replacement for repairs

Fits cast-iron

Fernco Flexible 1-1/2 In. PVC DWV Elbow Pipe Fittings The primary difference is thatQuick ELL lets you make 90 deg. connections of all common household drain, waste, and vent pipes without using special tools or fittings. Exceptionally flexible and extra long neoprene rubber. It is an ideal replacement for repairs. Do not use in pressure applications. Used for repair or alteration of drain, waster, or vent pipe and fittings. Fits cast iron, steel, plastic, lead, and copper pipe. Especially suited for in wall or other limited space