This is a replacement Teflon sealing washer for a CGA-170 gas regulator inlet fitting. The CGA 170 fitting has a gasketed connection that requires a flat washer to make the seal. The washer is typically not resueable, so it's good to keep a few spares on hand.

The CGA-170 size gas regulator fitting is authorized for use with non-corrosive gases and is used to connect regulators to small compressed gas cylinders (lecture bottles) in labs working with small quantities of gases or specialty gases.

Dimensions:

• Inside Diameter: 0.187 in.
• Outside Diameter: 0.427 in.
• Thickness: 0.105 in.

See part number P1012039 for the CGA-170 to 1/8" Male NPT fitting, short, made of stainless steel.

CGA fittings are standardized and authorized for the attachment of regulators and transfer lines to gas cylinders filled with specific gases at defined maximum pressures. The three digit number, CGA (XXX), corresponds to the specific gases for which that fitting is tailored (see the downloads).

Connections to cylinders should never be forced. CGA fittings mated between regulator and cylinder never use pipe dope or PTFE tape. CGA connections use either a bullet-nose or gasketed seal. The bullet nose connection has a metal-to-metal contact and seal. Some bullet-nose connections have an o-ring to help improve the seal and to allow a connection to be made without a wrench (hand-tight connections). A gasketed connection requires a flat washer to make the seal. CGA fittings are available in several materials including brass, stainless steel, nickel or chrome-plated brass, and Monel. The CGA fitting material to use depends on the gas and cylinder pressure.