Umehluko oyisisekelo phakathi kwepayipi lomoya elicindezelwe kanye neshubhu lomoya elicindezelwe yindlela ububanzi obuchazwa ngayo.Ipayipi likalwa ngobubanzi bangaphakathi kuyilapho ithubhu likalwa ngobubanzi obungaphandle.Njengesibonelo, ipayipi lomoya elicindezelwe elingu-3/8” linobubanzi obungaphakathi obungu-3/8”.