4256 0.45 μm PTFE membrane, hose barb 18/pkg 4258 1 μm PTFE membrane, hose barb 18/pkg 4003 1 μm PTFE membrane, 1/8 in. MNPT 18/pkg 4252 Integrity Test Kit (includes pressure gauge, 1/pkg 3-way valve, and 10 mL syringe) All units are identified with membrane, pore size, and lot number on