Copper Washer

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Copper Crush Washer - Group Bleed Screw & Sight Glass A small 12 x 6.2 x 1mm copper crush washer used in two spots on La Marzocco machines: under the group bleed screws and at the sight glass fitting. SPECIFICATIONS 12mm OD x 6.2mm ID x 1mm thick; copper COMPATIBILITY Fits: La Marzocco group bleed screws and sight glass fittings INSTALLATION DIY, quick swap whenever you remove either fitting. PRO TIPS Because it's copper, this washer work-hardens and takes a permanent compression set the first time it's torqued down, reusing an old one after removing a bleed screw or sight glass is a common source of small weeping leaks that look like a bigger problem than they are. Show more