- Joined
- 19 Feb 2009
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- 369
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When a 40mm or 32mm waste pipe exists the bathroom and into external soil stack, why is it you see some with a straight slope into strap on boss, and you see some that go down 6 inches or so and horizontal or 6 inches or so and then into boss. I've seen looads like this and it makes you think why use two extra elbows when you could use a single straight pipe.
Is it in case of back up?
Like this.
Is it in case of back up?
Like this.