Plugs an unused port on a John Guest push-fit fitting John Guest push-fit polypropylene plug is for plugging unused connection ports on a John Guest fitting. All John Guest fittings are manufactured and assembled in the UK. Features and benefits Compatible with John Guest fittings only Suitable for foodstuff, potable liquid, inert gases, air, pneumatic and vacuum applications John Guest Acetal Metric Plug 22mm Black (Pack of 10) PM0822E