Capacities up to 500mL with volumetric accuracy within 1%. Leak-tight to 30 psi or approximately 2 atmospheres. Built-in valve allows samples to be sealed within the syringe. Pressure-Lok® Magnums are the largest gas-tight syringes of inert PTFE and glass construction available. Low dead volume slip-on needle fitting and 20 gauge x 2" bevel point needle are included. Replacement needles are available.