I-elbow ye-duplex ye-PPR iyinhlangano yepayipi efanele ukuguqula indlela yezimpawu ezimbili noma izinhlangano zezimpawu ngokwe-90 degrees. Kuyobe kusebenzeka kakhulu ezindaweni ezifana nezimpawu zokunyakaza nokunyakaza, ezindawo zokusebenza, ezindawo zokuchemsha, ngezinye izindawo. Iyakwazi ukugcina izimpawu zezisize noma ezisize ukuba zizungezele kulezimpawu ezizungezile kuzo.
Ngoba isicwangciso se-PPR sisebenza kahle kakhulu ngokuthola ukuphepha, ukuphepha nokuphila kwamanzi, izimpawu zezokwelapha, izimpawu zezokwelapha, ukudla nokuphakamisa kanye nezindawo ezinye. Zingakwazi ukwaziwa ngokuphepha nokuphila kwezikhukhula kanye nokuphila kwezikhukhula futhi azizwe ngokuphepha, ukukhula nokuvaleka kwazo ngesikhathi sokusebenza kwazo.

Amagama angamaqembu: isicwangciso se-elbow se-PPR, eChina, abasebenzisi, abasebenzeli, ifa, ukuthengiswa, okuncane, isilinganiso esiphansi, kuzimba, isampulu esihlalweni, isampulu esihlalweni