A series of spring-loaded plastic check valves from Industrial Specialties Manufacturing are compact check valves that operate in any position with a 1/3 psi stainless steel spring and a guided stainless ball. Lightweight and economical, valves are available with nylon or polypropylene bodies and optional seals of Buna-N, EPDM, silicone or Fluroelastomer. Fitting options include 10-32 female threads; 10-32, ¼-28, 1/16 and 1/8 male threads; 1/16, 1/8, 3/16 and ¼ I.D. barbs; male or female luer. End fittings can be mixed or matched. These lightweight, chemical-resistant valves are available in bodies of PVC or NSF-approved white polypropylene.