Washing machine drain was installed by cowboy

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Hi everyone

My first time here and a bit of a tale of woe.
I had a laundry room built in my basement and it looks fab. but I'm getting bad smells and I think it is because a p trap was not fitted to the waste.

(and it is here dear readers that I curse myself. Back story: the builder turned out to be a real cowboy who cut corners at every opportunity. When I saw that he had put the drain for the washing machine behind a stud wall, and that it emerged from the plasterboard at about the 70 or 80 cm above the floor, I asked him whether a trap was in the line and he said "yes", and like a fool I believed him. )

So now I have bad smells, a drain that looks like it consists of a straight pipe that emerges from the plaster board almost horizontally and appears to run in a straight line to the sewer some 2 meters away just below floor level. I would like to to add a trap that I can see and clean.
Questions I hope you can help with;
What are my options?
1) e.g. can I simply add a p trap without a stand pipe to the existing pipe that projects? Or could I create a very deep trap? Must there be a stand pipe?
2) Should the trap be anti syphon?
3) I guess, at the worse of my expectations, I might have to rip out the plaster board and re work the drainage but that sounds very expensive and messy.

Any advice is very much appreciated.
 
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With the waste pipe at only a low exist point, you can still fit a standard washing machine waste to it.
You could manufacture you own, using 40mm elbows and about 800mm of 40mm pipe.
 
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I have had machine warranty work boys stating "no air admittance" and so I always bung the air admittance valve in even though we all know that it will be fine without.
 
To be honest I have had them say the same when connected to a spigot trap and you have to point them at the sink waste & say "air admittance".
Existing waste pipe is 70 - 80 cm off floor so hep valve & (short) standpipe may take it a bit higher than manus requirements so using spigot can keep it at this height.
 

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