Beswick’s miniature brass and stainless steel check valves are ideal for instruments requiring a low cracking pressure (less than 0.5 psid).  This ultra-miniature low cracking pressure check valve permits free flow in one direction and no (checked) flow in the opposite direction.  In addition to the low cracking pressure, the valve has excellent repeatability, and leak-tight operation.  These check valves are designed with an elastomeric duckbill and can withstand up to 250 psid in the checked direction. Barbed connections and various elastomers are available.