The humble 7/8" black plug button is used on almost all Invacare power chair models. Invacare uses this same little plastic plug as their joystick tube end plug, an armrest tube end plug, a footrest and leg rest tube end plug... and more. Everywhere that Invacare uses 7/8" diameter hollow tubing, they cap it off with this plug.

Whether you have a Pronto series chair, a Storm series, TDX series, a Nutron, or any other Invacare brand power chair or wheelchair, the 7/8" plug is an often overlooked component part.

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