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Re: What is a Vent?
If you look on your roof, you will see pipes sticking out of the roof aprox 12" high. For every pipe that goes down, one needs to go up. The obvious reason we have vents is that sewer gases need to be vented outside of the dwelling. Not so obvious is what happens if they are not included in the waste and vent design. Imagine yourself at McDonalds drinking a soda from a straw. If you put your thumb over the straw, you can pull liquid up from the cup.
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most likely that it is a old drain pipe as some plumbers used copper for that purpose. if it is a drain all u have to do is cap it. if it turns out to be a vent pipe u can install a end of the line vent cap. I cant remember what it is called but your supply store will know. just tell them u want to install a vent under the sink not through the roof.
I know that you need to install the vent but if you can pick a different location it would be better for energy efficiency because of associated downdrafts that may occur. If you can locate the vent to go through a wall to the outside it would probably be better, If that is too big a project maybe consider an indoor venting system. If you wish to use the attic assure that you add a "draft trap" (see link) and assure you clean the dryer vent pipe at least 1/yr. http://plumbing.hardwarestore.com/51-600-dryer-vent-accessories/draft-blocker-inline-damper-602022.aspx
does it leak from air vent if so you can unscrew return valve cover and close it of with adjustable spanner, turn the flow to off. using a vent key remove vent screw, should not be too much water but have mop bucket and old cloths at the ready.wrap some PTFE tape (got in most diy shops) around vent in anti clockwise direction and screw it back in open valves and bleed rad to vent the air... alternatively there is some good plumbing videos on you tube covering a lot of plumbing problems..
Did you put an 1 1/2" vent pipe? It must be vented to the open air. Air must flow in and out of the vent pipe at all times so it can work properly. I had the same issue but after removing the cheater vent from the vent pipe it solved my problem. They do not recommend using an air admittance valve, cheater or mechanical vent on the vent pipe, as it only allows air to flow in or out.
You cannot use a cheater, studdor or mechanical vent or an AAV on any Saniflo product. As they are considered one way vents, they only allow air to flow one way. Saniflo pumps must have an 1 1/2" vent pipe vented to the open air, air must flow in and out of the vent pipe at all times, otherwise the pump will short cycle and the solids will not leave the toilet. You will have to flush it several times to get rid of the waste and eventually the motor will go bad. Make sure is vented properly.
Look for your main plumbing vent that goes out your roof, is it pluged with a nest or something? When your drain system drains, it needs outside air from the vent to keep the system from vaccume lock. Same as vapor lock in the gas line on your vehicle. If the system is'nt getting air it will **** the water from the traps in your drain system like it is doing in your toilet. You may have to have a professional drain cleaner or plumber correct your pluged vent.
Depending on local codes, you may need to vent a 2" line separately out the roof. Otherwise, you may tie this vent into the other house vent line, but it should be a 2" vent conected to another 2" vent line. Again, you will have to check local codes. The drain connection should be made with a 2" connection into the top of a 4x2" wye 10' from any other connection. This follows most plumbing ordinances.
Yes you can connect 2 together, obtain 1 longer hose or use a fixed rigid pipe suitable for hot water etc - similar to drain pipe. All these shouled be readily available from your local plumbing supplies store.
in most instances there will be one or more bends in vent pipes. The chances of a clog are small. You can run any plumbers snake or even an electricians snake through the vent pipe. the easiest access is usually from the roof.