This is one of the hardiest syringes available for gas sampling. The Series A-2 features a unique push-button valve that allows sample storage capability in syringes as small as 25 ul. It is also useful for samples with low-boiling components that could be lost through evaporation. The push-button valve allows for pre-pressurizing the samples before injection. The A-2 syringe has very low dead volume due to the special needle and needle connector. The removable needle is 0.028" OD x 0.005" ID x 2" length, with a beveled (sharp) point.