Hi All,

I have fitted a new bathroom sink and the run to the main waste is around 4m. It gurgles so decided to switch the existing bottle trap for an anti-siphon one.

https://www.screwfix.com/p/mcalpine-...ite-32mm/37314

What I thought would be a 2 minute job...... The anti-siphon one is much deeper than the current one and unfortunately the drawer of the cupboard under the sink hits it - it is probably about 10mm too deep. I have looked around the web and it seems like they are all the same depth (approx 120mm from the centre of the waste pipe to the bottom). So to fix the issue I have the following thoughts although none really good...
1. The bottom of the 2 traps look like they are interchangeable so I could swap them. However the bigger one has a plastic pipe which goes down the centre of the bottle bit. I suspect this is key to the anti siphon bit. I could cut this to enable the shorter one to fit but suspect I may be back to gurgling
2. I cut 10mm off the chrome waste thread to lift the lot up. From a waste perspective that would probably work but the chrome waste is silicone in so would be a bit of a pain and also cutting it smooth and straight to ensure a good seal would be difficult
3. Fit an inline anti-siphon valve and use the original trap. This is a bit of a pain so would ideally not go down the route.

Anyone have any bright ideas?

thanks

Lee.

Surely it is only the back end of the drawer that catches the trap, can you not cut out a 10mm deep notch wide enough to go round the bottle trap?

Richard

On Tuesday, 17 March 2020 16:07:27 UTC, Tricky Dicky wrote:
Surely it is only the back end of the drawer that catches the trap, can you not cut out a 10mm deep notch wide enough to go round the bottle trap?

Richard

If only life were that simple The drawer is a bit weird and it has a bar that goes across the back which rotates as you move the drawer in and out. Not entirely sure what it does but it would have to go as well.

On 17/03/2020 15:44, Lee Nowell wrote:
Hi All,

I have fitted a new bathroom sink and the run to the main waste is
around 4m. It gurgles so decided to switch the existing bottle trap
for an anti-siphon one.

https://www.screwfix.com/p/mcalpine-...ite-32mm/37314



straight to ensure a good seal would be difficult 3. Fit an inline
anti-siphon valve and use the original trap. This is a bit of a pain
so would ideally not go down the route.

That's what I did when I redid bathrooms a little while back, just
fitting a tee into the waste pipe, and stuck an AAV on that, and then
used a normal trap on the basins.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Tuesday, 17 March 2020 15:45:02 UTC, Lee Nowell wrote:
Hi All,

I have fitted a new bathroom sink and the run to the main waste is around 4m. It gurgles so decided to switch the existing bottle trap for an anti-siphon one.

https://www.screwfix.com/p/mcalpine-...ite-32mm/37314

What I thought would be a 2 minute job...... The anti-siphon one is much deeper than the current one and unfortunately the drawer of the cupboard under the sink hits it - it is probably about 10mm too deep. I have looked around the web and it seems like they are all the same depth (approx 120mm from the centre of the waste pipe to the bottom). So to fix the issue I have the following thoughts although none really good...
1. The bottom of the 2 traps look like they are interchangeable so I could swap them. However the bigger one has a plastic pipe which goes down the centre of the bottle bit. I suspect this is key to the anti siphon bit. I could cut this to enable the shorter one to fit but suspect I may be back to gurgling
2. I cut 10mm off the chrome waste thread to lift the lot up. From a waste perspective that would probably work but the chrome waste is silicone in so would be a bit of a pain and also cutting it smooth and straight to ensure a good seal would be difficult
3. Fit an inline anti-siphon valve and use the original trap. This is a bit of a pain so would ideally not go down the route.

Anyone have any bright ideas?




The critical thing is the depth of water in the trap.
Nothing else matters.

On Tuesday, 17 March 2020 15:45:02 UTC, Lee Nowell wrote:
Hi All,

I have fitted a new bathroom sink and the run to the main waste is around 4m. It gurgles so decided to switch the existing bottle trap for an anti-siphon one.

https://www.screwfix.com/p/mcalpine-...ite-32mm/37314

What I thought would be a 2 minute job...... The anti-siphon one is much deeper than the current one and unfortunately the drawer of the cupboard under the sink hits it - it is probably about 10mm too deep. I have looked around the web and it seems like they are all the same depth (approx 120mm from the centre of the waste pipe to the bottom). So to fix the issue I have the following thoughts although none really good...
1. The bottom of the 2 traps look like they are interchangeable so I could swap them. However the bigger one has a plastic pipe which goes down the centre of the bottle bit. I suspect this is key to the anti siphon bit. I could cut this to enable the shorter one to fit but suspect I may be back to gurgling
2. I cut 10mm off the chrome waste thread to lift the lot up. From a waste perspective that would probably work but the chrome waste is silicone in so would be a bit of a pain and also cutting it smooth and straight to ensure a good seal would be difficult
3. Fit an inline anti-siphon valve and use the original trap. This is a bit of a pain so would ideally not go down the route.

Anyone have any bright ideas?

thanks

Lee.

Put the original trap back, you'll find the anti-syphon one gurgles too. If you look at the new one you'll notice you can convert the original by tying a little bit of tube in the right place.

Often gurgling is caused by problems with the downstream drainage.


NT

On Tue, 17 Mar 2020 08:44:55 -0700 (PDT), Lee Nowell wrote:

Hi All,

I have fitted a new bathroom sink and the run to the main waste is around 4m. It gurgles so decided to switch the existing bottle trap for an anti-siphon one.

https://www.screwfix.com/p/mcalpine-...ite-32mm/37314

What I thought would be a 2 minute job...... The anti-siphon one is much deeper than the current one and unfortunately the drawer of the cupboard under the sink hits it - it is probably about 10mm too deep. I have looked around the web and it seems like they are all the same depth (approx 120mm from the centre of the waste pipe to the bottom). So to fix the issue I have the following thoughts although none really good...
1. The bottom of the 2 traps look like they are interchangeable so I could swap them. However the bigger one has a plastic pipe which goes down the centre of the bottle bit. I suspect this is key to the anti siphon bit. I could cut this to enable the shorter one to fit but suspect I may be back to gurgling
2. I cut 10mm off the chrome waste thread to lift the lot up. From a waste perspective that would probably work but the chrome waste is silicone in so would be a bit of a pain and also cutting it smooth and straight to ensure a good seal would be difficult
3. Fit an inline anti-siphon valve and use the original trap. This is a bit of a pain so would ideally not go down the route.

Anyone have any bright ideas?

thanks

Lee.

Just changed the bath and basin traps (one v. shallow; one bottle) for
waterless ones. McAlpine MacTrap for the bath - that's outside (tested
winter before last (just over a year ago) and it desn't freeze. HepVO for
the basin, direct on the basin, not too satisfied, so that'll go outside
eventually.
The basin one is a long way down (about 12" or so to bottome of bend) but
when I move it there'll be only the elbow below the outlet.
--
Peter.
The gods will stay away
whilst religions hold sway

Can't,you run a siphon break connection back to a higher point in the stack?

Hi All

Sorry for the delay in replying. Looks like my only option is to put an anti-siphon valve inline somewhere.

My setup is as follows. It is an upstairs bathroom and the sink waste goes in a stud wall, down to below the floor then essentially a straight run of around 4 or 5m and then into a vertical soil stack down into the drain. The only viable place to add the anti siphon valve is on the straight run. If absolutely necessary I could put it next to the trap but access is difficult and I don't believe the pipe coming out of the wall is long enough to fit valve then trap.

I have a few questions
1. Is an anti siphon valve likely to solve the gurgling problem?
2. Will fitting it on the straight run work ok? If so assume as close to the trap as possible as opposed to the soil stack end?

Thanks

Lee.

On Tue, 17 Mar 2020 08:44:55 -0700 (PDT), Lee Nowell
wrote:

Hi All,

I have fitted a new bathroom sink and the run to the main waste is around 4m. It gurgles so decided to switch the existing bottle trap for an anti-siphon one.

https://www.screwfix.com/p/mcalpine-...ite-32mm/37314

What I thought would be a 2 minute job...... The anti-siphon one is much deeper than the current one and unfortunately the drawer of the cupboard under the sink hits it - it is probably about 10mm too deep. I have looked around the web and it seems like they are all the same depth (approx 120mm from the centre of the waste pipe to the bottom). So to fix the issue I have the following thoughts although none really good...
1. The bottom of the 2 traps look like they are interchangeable so I could swap them. However the bigger one has a plastic pipe which goes down the centre of the bottle bit. I suspect this is key to the anti siphon bit. I could cut this to enable the shorter one to fit but suspect I may be back to gurgling
2. I cut 10mm off the chrome waste thread to lift the lot up. From a waste perspective that would probably work but the chrome waste is silicone in so would be a bit of a pain and also cutting it smooth and straight to ensure a good seal would be difficult
3. Fit an inline anti-siphon valve and use the original trap. This is a bit of a pain so would ideally not go down the route.

Anyone have any bright ideas?

thanks

Lee.

After investigation into what the hell anti-syphon means, it doesn't
look any deeper than other traps from the same maker. Have you
considered a waterless trap?
https://www.screwfix.com/p/mcalpine-...2-x-32mm/863hp
--
Dave W

On 24/03/2020 00:05, Dave W wrote:
On Tue, 17 Mar 2020 08:44:55 -0700 (PDT), Lee Nowell
wrote:

Hi All,

I have fitted a new bathroom sink and the run to the main waste is around 4m. It gurgles so decided to switch the existing bottle trap for an anti-siphon one.

https://www.screwfix.com/p/mcalpine-...ite-32mm/37314

What I thought would be a 2 minute job...... The anti-siphon one is much deeper than the current one and unfortunately the drawer of the cupboard under the sink hits it - it is probably about 10mm too deep. I have looked around the web and it seems like they are all the same depth (approx 120mm from the centre of the waste pipe to the bottom). So to fix the issue I have the following thoughts although none really good...
1. The bottom of the 2 traps look like they are interchangeable so I could swap them. However the bigger one has a plastic pipe which goes down the centre of the bottle bit. I suspect this is key to the anti siphon bit. I could cut this to enable the shorter one to fit but suspect I may be back to gurgling
2. I cut 10mm off the chrome waste thread to lift the lot up. From a waste perspective that would probably work but the chrome waste is silicone in so would be a bit of a pain and also cutting it smooth and straight to ensure a good seal would be difficult
3. Fit an inline anti-siphon valve and use the original trap. This is a bit of a pain so would ideally not go down the route.

Anyone have any bright ideas?

thanks

Lee.

After investigation into what the hell anti-syphon means, it doesn't
look any deeper than other traps from the same maker. Have you

Anti syphon does not mean it needs to be any deeper - it just needs an
AAV on the sewer side of the water trap.



--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Tuesday, 17 March 2020 21:59:49 UTC, PeterC wrote:
On Tue, 17 Mar 2020 08:44:55 -0700 (PDT), Lee Nowell wrote:

Hi All,

I have fitted a new bathroom sink and the run to the main waste is around 4m. It gurgles so decided to switch the existing bottle trap for an anti-siphon one.

https://www.screwfix.com/p/mcalpine-...ite-32mm/37314

What I thought would be a 2 minute job...... The anti-siphon one is much deeper than the current one and unfortunately the drawer of the cupboard under the sink hits it - it is probably about 10mm too deep. I have looked around the web and it seems like they are all the same depth (approx 120mm from the centre of the waste pipe to the bottom). So to fix the issue I have the following thoughts although none really good...
1. The bottom of the 2 traps look like they are interchangeable so I could swap them. However the bigger one has a plastic pipe which goes down the centre of the bottle bit. I suspect this is key to the anti siphon bit. I could cut this to enable the shorter one to fit but suspect I may be back to gurgling
2. I cut 10mm off the chrome waste thread to lift the lot up. From a waste perspective that would probably work but the chrome waste is silicone in so would be a bit of a pain and also cutting it smooth and straight to ensure a good seal would be difficult
3. Fit an inline anti-siphon valve and use the original trap. This is a bit of a pain so would ideally not go down the route.

Anyone have any bright ideas?

thanks

Lee.

Just changed the bath and basin traps (one v. shallow; one bottle) for
waterless ones. McAlpine MacTrap for the bath - that's outside (tested
winter before last (just over a year ago) and it desn't freeze. HepVO for
the basin, direct on the basin, not too satisfied, so that'll go outside
eventually.
The basin one is a long way down (about 12" or so to bottome of bend) but
when I move it there'll be only the elbow below the outlet.

Quiet a few years ago, when I did our bathroom, I used HepVO for basin, bath and basin in downstairs WC immediately below.

At least ten years without any problems other than once or twice having to open it up due to lots of long dark hair. Not mine. Having three of them meant that they acted as air admittance for each other even if the bath was in use.

I also used good quality flexible waste pipe (was that Hepworths as well? not sure). I'd do exactly the same again if refitting another bathroom.