Plumbing Supplies
CS1mm 2mm 3mm 4mm Black O Ring Gasket Washers Insulated Sealing Ring Thickness Rubber Silicone(OD7mm CS1mm)
O-Rings O-ring sealing ring
https://www.bizrate.co.uk/plumbingsupplies/cs1mm-2mm-3mm-4mm-black-oid40390999946.html
