Parts Ordered for Check Valve Aparatus :
Y-connector from Cole-Parmer :
Always in Stock - Idex Low-Pressure Y Connector Body, Natural PEEK, 0.020" Bore, 1/16" OD Tubing, 1/4-28 Flat Bottom; 1/EA from Cole-Parmer (coleparmer.com)
Check Valves from Cole-Parmer , versions with different direction :
Idex Inline Check Valve, Inlet, 3 psi, 0.02" ID, 1/4-28 (M) to 1/4-28 (F) Flat Bottom, 1/8" OD Tubing; 1/EA from Cole-Parmer (coleparmer.com)
Idex Inline Check Valve, Outlet, 15 psi, 0.02" ID, 1/4-28 (M) to 1/4-28 (F) Flat Bottom; 1/EA from Cole-Parmer (coleparmer.com)