Danco 36651W Slip Joint Washer 1-1/2 " (100 per bag) Durable rubber construction Used as a seat between the PO plug and underside of the lavatory basin Part No. 6B; 1-1/2 in. Nut size; 1-1/2 in. Tube size 1-3/4 in. OD x 1-1/2 in. ID x 3/16 in. Height Use with No. 6 Ring/100 per bag