Within the Red Hat certification program, the RHCA is considered the most complete (and grueling) certification among the seven major Red Hat certifications. In fact, some equate the prestige of the RHCA to that of the Microsoft Certified Master and possibly the CCIE.
A plumbing fixture like a sink can not function properly without a sink vent. When a drain pipe drains it creates a negative pressure in the sink drain; the negative pressure will pull the water out of the p-trap of the sink that's draining and sewer gases can enter your home if a sink vent is not installed.
Dishwasher Venting and Draining Methods: Air Gap Method-Connecting the drain line to an air gap is one method for installing a dishwasher. In some areas the building codes require that a dishwasher be connected to an air gap installed on the sink.Air gaps are there to keep any contaminants in the drain line from entering the potable water system.ir Gap Method-Connecting the drain line to an air gap is one method for installing a dishwasher. In some areas the building codes require that a dishwasher be connected to an air gap installed on the sink.