3 Review(s)

2 & 4 hole connector with silicon tubing 2 Hole (Borden Connection) Usually the standard in developing countries . Has one large hole, which is air intake to drive the turbine to spin, and a small hole for water to cool the bur/tooth. No air exhaust, so the exhaust just blows right out of the handpiece, making it much louder. Also, no chip air, so the water comes out more as a stream than as a fine mist. A 2/4 adapter can be used to fit this kind of handpiece onto 4 hole tubing, but the handpiece will still not have the chip air or exhaust air features. . Has two large air holes (the smaller of the two is air in and the larger is air exhaust out). Also has two small holes, a water tube and a chip air tube (which brings air to the head where it either mixes with or hits the water to make a fine mist) to cool the bur/tooth and clear debris. A 4/2 adapter can be used to fit this kind of handpiece onto 2 hole tubing, but the handpiece will lose the exhaust and chip air feature.