Improperly installed you will refer to it as the 'Stank Vat. The vent must rise vertical from the sewage ejector containment until it reaches a point that is at least 6' high than the flood level rim of the highest fixture served by the ejector. Properly installed you will have a good running system with no smells. The Liberty Pumps P382LE51 is a pre-assembled residential and light commercial sewage ejector package in a shallow system design. This work should be permitted and inspected. The imortant thing here is you need that vent and the work should be done in accordance with your local code. If you don't care for his way of doing it seek another opinion. Imagine sucking on a empty plastic coke bottle, that’s kinda what your ejector pump would be doing, now imagine you poke a hole. The ejector would almost certainly kick on while the washer discharges and by dumping into the vent you will be cutting it off completely.

You may want to discuss this with your plumber and have him explain his reasoning. A washer puts out the most water the fastest of any fixture in your home. One thing I try to consider is finding the least intrusive way possible to run this vent. This is a case of there may be many ways to do the same thing. In any case the vent must run pitching back to the pit so that any condensation in the vent or, rain falling in the vent will drain back to the pit and the vent will drain dry. In some areas it may be required to be independent of other vents, while in others it may tie into existing vents. Local codes do have bearing on what is allowed. How this vent is run can have a lot of variation.

It is good that your plumber insists on having a through the roof vent. I installed a high-water alarm in the basin and used that outlet. When wiring the bathroom I added an additional GFCI outlet next to the pump. This venting of the pit cannot be accomplished by an AAV (Air Admittance Valve) as it is a one way valve. The sewage line goes through a check valve and then into the point where it connected it to the main sewer. The traps of fixtures also have to be protected by venting. In which case the vent would be required to convey both any sewer gasses present in the sewage ejector crock and the exhaust air from the air propulsion system. The air in the pit has to leave as the pit fills with waste and it has to come in as the pit is pumped out. A pneumatic sewage ejection pump is a pump that is propelled by high pressure air instead of electricity. Use a quality brand such as Zoeller.A pit does require a through the roof vent. Liberty Pumps P372LE51 Sewage Pump System, 1/2HP, 115V, 2 discharge, 21x30. The lid is gasketed and provided with a vent and as such we do not experience odor issues. 20-1/2 Sewage Basin Cover Vent 2 or 3 87.4287.42. The lid is level to slightly above the concrete floor. Sewage Ejector Pump to the house gravity drain system can be rather complex. of dynamic head pressure, with a maximum vertical lift (shut-off) at 21.5 feet.

The Model 266 pump is 1/2 HP and has a flow rate of 128 gpm5 ft. These pumps are able to pass 2' spherical solids due to the non-clogging vortex impeller design. I would say this is a rational and economical approach. As seen so far, sewage ejector systems play a key role in wastewater treatment. The sewage ejector pit must have a dedicated vent through the roof and the vent. These Zoeller sewage pump systems include top quality sewage ejector pumps. Sounds like your plans are having the detached garage gravity flow to the basement bathroom group which are then both served by the ejector crock. It pumps vertically to the basement ceiling and connects into the hung sewer which then takes it away via gravity. Venting is typically done using a vent pipe, which is connected to the pump and extends above the roofline of the building. This prevents the build-up of pressure, which can lead to malfunction or damage to the pump. The detail is similar to what is posted above and it is cast into the concrete floor. The purpose of venting a sewage ejector pump is to allow the release of air and gases that are trapped in the system. When we have hung sewers, we put an ejector crock with pump in the basement mechanical room and it serves the basement bathroom group. In this case the basement (and apparently also your detached garage) can't gravity flow as they are lower than the sewer invert. You have what we call a 'hung' sewer meaning that your home's sewer is hung from the basement ceiling to enable gravity flow.

Sewage ejector system vent