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The short answer is yes, but like all answers comes with conditions. In a traditional residential Plumbing system all drain lines eventually connect together, everything is interconnected.
The long answer is that connecting fixtures to a drain system must follow certain rules and good practices which have been proven over time. Assuming you have a rudimentary knowledge of plumbing systems you may proceed with the following.
You may connect to your horizontal toilet waste pipe but should be 3-5 pipe diameters downstream any vertical portion (like where it turns up to the toilet, or turns to go up a wall for an upstairs toilet.) If you do connect to a horizontal portion the new pipe must be sized to serve as both a drain (for the new fixture) and as a vent (for both the new fixture and the toilet.) this means that the new drain must connect back into the vent system (at least 6" higher than the rim of the highest fixture connecting to that system) OR must vent separately out the roof of the building or through an approved air admittance device. (basically an air valve in the cabinet or wall space that lets air into the system but not out. - -air valves have special provisions and are tricky so research them thoroughly before installing one.)
You may also connect to a vertical stack. (a large pipe serving fixtures on the floor above) When connecting to a stack you need only size the new pipe to serve as a drain and vent for the new fixture. Generally you may connect to any portion of the vertical stack (high or low) as long as you use a wye branch fitting or other approved drainage pattern fitting. hope this helps.
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Do you need a vent on your toilet waste pipe our waste pipe goes in to the loft which is connected to a vent on the roof tiles I want to cut the pipe back to about 3 foot high can I just blank it off?
No, it has to be vented
What size vent is needed for a toilet 2in 3in etc?
Any vent is usually the size of the drain or waste pipe it is connected to. 3 or 4 inch on a toilet.
Why does toilet over flows when doing laundry?
The laundry waste pipe is fitted to the main drain near the toilet and the main pipe down the line past toilet is partly plugged, forcing the laundry waste up the toilet waste tube. You need to auger the pipe from toilet to outside. If all the piping is in ground you will have to remove toilet from floor to do this properly.
Downstairs toilet is it ok to saddle the waste pipe from the sink onto the toilet waste pipe ontop of the insulation before floor is poured?
No, Saddles are illegal in most civilized countries
What is a toilet tank valve connected to?
It's connected to the incoming cold water supply pipe.
Can you have a p trap waste pipe on a toilet that is on the ground floor?
You CAN'T have a p-trap under the toilet! The p-trap is built into the toilet!
What if a toilet flange will not fit in the drain pipe?
The easiest solution would be to move the toilet so that it lines up with the waste pipe.
How high should the waste pipe be to install a wall mounted toilet?
Depends on the design, but I suspect you set the seat height to the correct position and work from that, not use the waste as a height guide.
What can the waste pipe bend clearance be through floor for toilet closet?
6 foot
Can you connect a new toilet to an older toilet vent?
Yes if the vent pipe is 4" and vertical by code and there is nothing connected between your toilet tee and where you would connect your new toilet tee. If not worried about codes then yes you can connect to a 3" vent line if no other vent lines are connected down stream. If you have a vent pipe that is less then 3" and or you have other vents connected between your old toilet tee and your new toilet tee then NO you can not connect a new tee for your toilet.
Does a toilet waste pipe require a trap?
The trap is built into the toilet itself, you shouldn't put one in the drain.
How does a soil pipe work?
A soil pipe is a vertical pipe that is part of a plumbing system and is used to carry waste materials from toilets and other plumbing fixtures to the sewage system or septic tank. It works by using gravity to allow waste to flow downwards and out of the building. The soil pipe is connected to the toilet's drain and is designed to prevent the escape of foul odors and gases.
