Small drain seal cover needed?

boardtc

There was a drain an sewer installed outside one room that was going to be a toilet before we took over the house build and we never used them. I have closed it off with a 4" pipe stopper. That allows some water to build up over it, which will eventually start smelling I'd say:




It's 14.5cm square. Can I get a drain seal cover to stop water getting in? I couldnt see anything suitable on Amazon.

Fine Cheers

Think they are called gully sealing plates but yes it seems an unusual size. You often see a piece of marine ply cut to size as a temporary seal on construction sites or would it be possible to cut down an AJ cover ?

The Continental Op

Why not just fill it with a lean mix of sand and cement? If its lean enough it will stay in place but come out easily if it ever needs to.

Take the plug out first and give the thread and the metal surfaces a really good greasing. Those plugs are normally used for drain testing and I don't think they are meant to be left indefinitely in place. The threads on the new ones certainly rust (old ones were brass and cast iron). You could even grease the sides of the plastic so the cement doesn't stick to it.

boardtc

That's great, the plug is only in about 5 months. I had to google lean concrete, I learned that concrete with cement content of less than about 10 % of the total contents can be called lean concrete. I think it means adding gravel too (aggregates), so a ratio of 6 gravel / 3 sand / 1 cement. Is that about it?

The Continental Op

boardtc wrote: »

That's great, the plug is only in about 5 months. I had to google lean concrete, I learned that concrete with cement content of less than about 10 % of the total contents can be called lean concrete. I think it means adding gravel too (aggregates), so a ratio of 6 gravel / 3 sand / 1 cement. Is that about it?

Thats the technical use of the word lean and it stands here but my meaning was just a mix that only had enough cement to hold it all together.

If you are doing that make sure you put something around the wing nut on the plug so you don't cement it in place.

boardtc

Super tips, thanks. Ok, get you, would say 7 sand to 1 cement be a suitable mix?

The Continental Op

I'd probably do it around 8 to 1 but if you fill the bottom around the thread with a bit of scrap polystyrene the then put some grease on the sides I don't think you'll have any problem getting any mix out again if you have to. You could fill with a 8 to 1 mix then finish off the last half inch with a stronger mix.

boardtc

Super, I'll do that. When you say grease, is it something like this? https://www.woodies.ie/wd40-specialist-lithium-grease-250ml-1137196

The Continental Op

Perfect but just some solid cooking fat would do the job at a pinch.