GetPlumb technical guide
Find the right WC pan connector without guessing
Match four things: the pan spigot, the soil-pipe connection, the route between them and the working reach. Shape alone is not enough.
Identify yours in four checks
Pan spigot
Measure the clean ceramic outlet across its outside diameter. Standard McAlpine WC connector inlets accept 97–107 mm.
Soil end
Decide whether you have an open pipe bore, a ring-seal socket or legacy cast iron. Measure after removing and cleaning the old fitting.
Geometry
Record whether the soil connection is straight behind, offset, angled, below or concealed behind a back-to-wall pan.
Working reach
Measure face-to-face with the WC in its finished position. Allow for insertion at both ends; do not size to the connector's absolute limit.
First choose the correct outlet
4 in / 110 mm finned
Rubber fins seal inside a suitable 110 mm PVC-U or cast-iron bore. Common on standard WC-CON products, 4 in MACFIT connectors and flexible codes ending R.
110 mm plain end
A smooth rigid spigot enters a 110 mm ring-seal socket. Look at WC-CON3, WC-CON6, WC-CON9, WC-CONQP and flexible codes ending P.
90 mm or 75 mm finned
Measure the actual bore. McAlpine S variants and MAC-3 suit specified 90 mm connections; MAC-3C is the specialist 75 mm option.
Six useful GetPlumb options, shown with the actual listing images
Straight, finned outlet
For aligned pan and open 110 mm soil-pipe bores. The simplest flow path when no correction is needed.
View WC-CON1 →
Straight, plain outlet
For a direct route into a 110 mm ring-seal socket. Do not confuse its smooth end with a finned bore seal.
View WC-CON3 →
20 mm offset
Moves two parallel centre lines by a controlled 20 mm. Measure centre-to-centre; an offset is not extra reach.
View WC-CON4 →