Plumbing for a Washing Machine: Waste Options



If there is a sink waste pipe running behind or along the side of the machine (and providing the machine is suitable), connect the outlet hose directly to it using a self-cutting connector similar to the one used in Supply Option 1. Such connectors are designed to fit standard 38mm (1-1/2″) pipe.

You don’t need any special tools: the connector has its own cutting tool which is removed from the saddle clamp once the hole has been cut, ready for the hose connector assembly to be screwed to the clamp body.

1. Fit the adjustable clamp (complete with internal seal) round the waste pipe and screw in the cutter to make the hole. Remove the cutter.

waste options for washing machine - direct connection

2. Attach the hose connector and non-return valve to the clamp, with or without the elbow supplied, depending on the angle. Then fit the machine outlet hose.



replace sink trapNear the kitchen sink, it may be easier to replace the sink trap with one incorporating a washing machine hose outlet.

Unscrew the old trap, using a damp cloth to grip the locking rings. Assemble the new trap according to the instructions, then screw to the sink outlet and waste pipe, letting the trap’s push-fit joints take up any adjustment. Finally, fit the drain hose to the outlet on the side of the trap.



A standpipe prevents siphonage of the waste during washing by incorporating an air break.

The standpipe itself should be about 600mm (24″) high (check the machine instructions), and must have a trap fitted below it. If there is an existing waste pipe running near the machine at floor level, connect the standpipe as shown. See Problem Solver – Washing Machine Drainage Problems if you have to run a new waste pipe.

fit standpipe  (a)a) Mark the position of the swept tee fitting on the waste pipe, allowing for the amount taken up by the joints. Cut the pipe with a junior hacksaw.

b) Fit the tee fitting with the swept part angled in the direction of the flow. Follow by adding the two parts of the trap and the standpipe.

c) Secure the assembly to the a wall using 38mm (1-1/2″) pipe clips. Finally, simply slip the washing machine outlet hose into the top of the standpipe.

fit standpipe (b) and (c)


Local bye-laws

Some water authorities only permit certain types of connection, and others forbid taking the cold supply direct from the rising main. Phone the authority’s engineer’s department and check what rules apply in your area before buying any parts.

25. May 2011 by admin
Categories: Appliances, Plumbing | Tags: , | Comments Off on Plumbing for a Washing Machine: Waste Options


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