The apparatus comprises a pressure pump and a valve coupled together in fluid communication with each other and wherein the pressure pump has an inlet coupled in {HEAD ~ fluid communication} with an air source and the valve has an outlet coupled in fluid communication with {TAIL ~ the drain} 
The apparatus comprises a pressure pump and a valve coupled together in fluid communication with each other and wherein the pressure pump has an inlet coupled in { HEAD ~ fluid communication } with an air source and the valve has an outlet coupled in fluid communication with { TAIL ~ the drain }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL