What Are  Plumbing Vents?
& Why Do You Need Them?

Does your home have a sewer vent pipe? Does it need one? What do they do? Dr Leak has all the answers you need, and this article examines this element of your plumbing system, offering practical tips and advice on their types, installation, sewer vent pipe regulations in Australia, and how to deal with blockages.

Off senior & pensioners
Off Online bookings
Conditions apply*
Request a quote
Get in contact with us today for all your plumbing needs
Contact Us
Now Open!

Leaking tap?
Get it fixed today!

FOr Fast assistance
1300 375 325
%0 Finance 
Alice Chan (Arisu)Alice Chan (Arisu)
00:28 15 Apr 24
Very happy, great service, efficient. Vince really nice
Sass MahonySass Mahony
06:24 12 Apr 24
Fast and friendly service. Couldn’t be happier with the service Chris JNR provided.
Claire FrenchClaire French
05:31 10 Apr 24
Daniel PetrucciDaniel Petrucci
10:10 09 Apr 24
Vince was able to provide a quick turnaround for a new hot water tank for my elderly parents. From a professional itemised and competitive quote to then making himself available on short notice to install. He even disposed of the old tanks at no additional cost. Highly recommended.
Kenneth TsangKenneth Tsang
07:21 09 Apr 24
I was having a small issue of leaking tap. On hindsight, it is probably just one broken tap valve.The plumber came and claimed that the both of the tap handles needs to be replaced without taking out the handle. He claimed that, for this model, the tap valve is stuck to the handle. And the only way to fix was replacing the whole handle.After the old handles were taken out, I checked them and discovered the problematic tap valve was not stuck. He then claimed that the the handle was "too old" and it had rust on it so there was a need to replace the whole handle. As far as I could check afterward, the handle thread is fine and it can adjust the valve position fine.He recommended a tap handle model, which, he claimed, is "much better" than my old one. However, as far as I can tell, they look exactly the same.If you have a leaking tap, I would not recommend this company because it will cost you ~$600.
Matthew GreenMatthew Green
05:43 08 Apr 24
I had a leaking shower and within a few hours they had someone to my house and fixed it. They were very professional and knowledgable and would recommend for any plumbing works.
Yun LaiYun Lai
03:37 03 Apr 24
Chris Jnr was a pleasure to deal with. Efficient service with informational offers and options and absolutely no pressure to sign up. Gave me some good options and ideas on price and a great working price. Work was completely quickly and professionally.Word of caution though. Don't send an online quote enquiry at 6am with "as soon as possible" because they will call you. That's not a bad thing, it was excellent service, just maybe.. (unlike me) expect a call... hahahaha.
01:03 02 Apr 24
Punctual and Vince is very personable. Explained clearly the options for the fix.
Kirstie MitchellKirstie Mitchell
00:50 01 Apr 24
Excellent all round service
Nena CrawfordNena Crawford
09:35 27 Mar 24
Thank you Ryan for your hard work and patience with me. I would highly recommend him for any of my plumbing needs.
Lisa O'NeillLisa O'Neill
10:14 22 Mar 24
Chris Jnr communicated well, turned up on time, repaired the issue quickly and quietly and then too cleaned up too! All in all an exceptional service experience. Thanks Chris.
Keith BettsKeith Betts
05:17 22 Mar 24
Natasha ArleguiNatasha Arlegui
02:28 18 Mar 24
Reliable, friendly service. Highly reccomend
Mike A TalebMike A Taleb
22:38 14 Mar 24
Professional services 👌Highly recommended
Margaret BentonMargaret Benton
06:05 14 Mar 24
Thank you for coming back out today to resolve my initial issue the guys were very understanding and polite

What is a  
plumbing vent system,
 and why would you need one?

By Chris Provenzale | August 2023

  • Founder / Director of Dr Leak Plumbing
  • License No. 368473C
  • Certificate IV in Plumbing & Services
  • Certificate III in Roof Plumbing
  • Kitchen, Bathroom & Laundry Renovation (KBLR) Licenced


Sometimes referred to as plumbing air vents or vent stacks, a property's plumbing vent system does not handle water, even though it operates as part of the overall plumbing system. Most modern plumbing systems comprise water drainage capabilities combined with a ventilation system. A sewage vent pipe typically runs vertically out through a property’s roof, doubling as both a point for air to air to enter and for unwanted gases and odours to be expelled. 


The primary purposes of a
  plumbing vent pipe

A toilet vent pipe is a crucial element in the system that helps regulate air pressure within it and maintain the flow. No plumbing fixture that flushes or guides water to different areas of the home can operate without this air pressure to propel the liquid. Without a vent pipe on the roof, the system creates a vacuum, leading to sluggish or non-existent drainage.


Another excellent feature of a vent pipe is that it removes noxious gases that can make their way from the sewer into your home. These gases smell foul, are highly flammable, and can be dangerous to health, causing nausea, dizziness, headaches, and fatigue.



A P-trap pipe is named because it looks like the letter ‘P’ facing downwards. Its primary function is to prevent sewer gases from entering your property by creating an airtight seal and holding enough water in the curved section of the P to prevent gas from penetrating. One arm of the pipe is connected to your home's sewer vent pipe, which allows the gas to escape into the atmosphere. A bonus feature of this system is that no foreign objects or creatures can enter your system this way, and it will also catch any items like rings that you accidentally drop down the sink.


A sewage vent pipe is typically found in one of three forms, namely:

  • Common vent — When opposite sides of the same wall have plumbing fixtures in place, they are linked to the flue by what is known as a ‘sanitary cross’.
  • Auxiliary vent — A pipe that runs upwards and over the feature to join the system’s common vent, usually attached to the drain line or behind the fixture itself.
  • True vent: Despite the name of its rival above, this is the most common type of toilet vent. Attached to the drain line, it can vent directly through the roof because it contains no water.
Contact a plumber

Signs that your
 sewer vent pipe

may be blocked

If a vent pipe becomes blocked, it will cause negative pressure to build up inside the plumbing system. This interrupts or seriously reduces the flow of water. Some signs that you may have a blocked plumbing vent pipe include:


  • Slow water drainage
  • Thoroughly clearing your water drain has little or no effect.
  • Unpleasant smells come into the property through the drains. This means your P-trap is probably waterless due to the negative pressure.
  • When running water elsewhere in the property, you can hear gurgling sounds from different pipes and drains. Typically, this is due to the air being sucked out of the P-trap.
  • Stagnant water in sinks and baths that will not drain.


👈 Watch the Most Trusted
Plumbing Company in Action.
Book Now
1300 375 325

Dealing with a blocked
toilet vent

Modern plumbing techniques use all the available technology to get the job done, and in the case of a blocked toilet vent pipe, cameras on flexible rods are the tool of choice. This provides a live feed that trained technicians can analyse, helping them to choose the best solution to the problem. You cannot attempt to fix a blocked sewer vent by yourself using DIY, so do not hesitate to contact the experts at Dr Leak if you experience any of the indications noted above.


Whether you need a plumber in Melbourne or roof and gutter leak repairs in Sydney, we're ready to assist and handle the situation quickly and cost-effectively. Although the water supplied by WaterNSW is typically of excellent clarity and cleanliness, should you experience discoloured water or other plumbing issues, don't delay; call Dr Leak and let us sort the problem for you quickly and efficiently. 

Why choose 
Dr Leak?

When only fully accredited, licensed, and skilled plumbers will do, contact Dr Leak Plumbing and let us provide the solution you need. We accept plumbing challenges of any size or complexity and pride ourselves on the following:

  • Fair, transparent pricing
  • Rapid call-out responses
  • The highest standards of materials and craft 
  • 24/7, same-day service and emergency assistance
  • No call-out fee when booking before 17:00 (5 pm)
  • A lifetime labour warranty
  • Focused, highly-trained specialist technicians
  • Clean working practices and no dirty footprints left behind
  • Friendly, courteous staff
  • Interest-free payment plans (6 months)
  • Discounts for booking online

Dr. Leak’s founder puts great value on the contributions of our older generations, and we offer special discounts for seniors in an attempt to give a little back. Our clients' satisfaction is of utmost importance to us, and we never do anything to compromise our impeccable standards or cut corners. You only have to glance at our reviews to see how much people value our efforts, and we strive to improve them every day, from the simplest leaking taps in Sydney to complete plumbing system overhauls. 

With over 15 years of plumbing experience we are the go-to people 

Give us a call

Reach out to our dedicated team today via phone or email to explain your plumbing situation and secure in a plumber. Contact us before 2pm for same day service.

Same day service

Upon arrival Dr Leak will thoroughly inspect the plumbing that needs to be done. After inspection, we report and provide the best options for you to choose from.

No job too big or small

Professional and reliable, at Dr Leak Plumbing Services we complete any plumbing job that comes our way.

Currently busy? Request a call back


Please take a moment to read our informative blog, and do not hesitate to contact us when you're ready to meet the team. We are standing by to address your questions and comments and give you all the advice and guidance you need. When you engage the services of the Dr Leak team, whether you need tap repairs in Melbourne or a plumber in Sydney, you can relax knowing you're in safe hands.


Don't wait to get your roof plumbing fixed  

Residential & Commercial Roof Plumbing Solutions

Drain CCTV camera inspection & sewer location
Outdoor drain excavation
Drain Repair, Replacement, Installation, cleaning & maintenance services
1300 375 325

What some of our customers say

Quick response, sorted out a new gas outlet in the house, friendly team
Leichhardt, NSW
Chris arrived promptly, fixed my leaky toilet and went above and beyond by replacing some extra components to ensure a more secure cistern in the future, while staying within the agreed budget. Highly recommend. Meegan, Dee Why
Dee Why, NSW
Dr Leak Plumbing were fantastic. They quickly assessed the issue with our roof and fixed it effectively and provided advice and additional tasks at the same time.
Randwick, NSW

Book a Plumbing Vents online today

Call us today on 1300 375 325 or simply complete the form below & we’ll get back to you as soon as possible
Contact Us 2
Kids With Cancer Foundation
$1 donated for every paying customer
Book Now
1300 375 325

Some of our Clients 

Anytime Fitness
Macquarie Shopping Centre
Orangetheory Fitness
Raine & Horne
First National Real Estate

Copyright© 2023. Dr Leak Plumbing Services. All Rights Reserved.