La San Marco Steam/Water Valve Rear Body Gasket Flat sealing gasket for the rear body of La San Marco steam and water valve assemblies. It's a small part, but a torn or hardened one is a classic source of a slow weep at the back of the valve body that gets blamed on the valve itself. SPECIFICATIONS Dimensions: 23.5 x 20 x 1 mm COMPATIBILITY Fits: La San Marco steam/water valve rear body assemblies Replaces: SM_263 INSTALLATION Straightforward DIY swap once the valve body is disassembled, no special tools needed. PRO TIPS If you're seeing weeping at the rear body seam rather than out the spout, replace this gasket before you assume the whole valve needs rebuilding, it's a five-minute fix that's often mistaken for a bigger job.