Hamilton’s ¼”-28 tubing assembly features 2 precision machined, 1/4"-28 HV/HV PCTFE fitting(s) with strain relief spring(s) across high quality 12 Gauge, (0.117" O.D / 0.085" I.D), 12" length FEP tubing. Compatible with any flat-bottom ¼”-28 port. Hamilton’s FEP tubing and PCTFE fittings are chemically resistant, temperature resistant, and durable for a leak-free connection each time.