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10,405 Posts
I'd use the trap.... there may not be gas, but there could be smelly drain stink.
DM
DM
washer drain line
2331
2
I'm moving my washer in the laundry room, but I have a question about drainage. We're on a septic system here, and the current washer drains into a french drain system and is carried 200 plus feet from the house out into a field. (Apparently, this is up to code in Alabama.) My question is...When I run my new drain line to be tied into the french drain system out back, do I have to install a p-trap before connecting the drain line to the french drain, or am I safe to let it just gravity drain since there's no gas coming back in?
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1,117 Posts
To add to DangerMouse's reply, a trap not only stops smelly drain stink, but it also stops (or at least greatly minimizes) unwelcome live things from coming in.
HRG
HRG
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