PCV Gromments with Integral Baffle to work with push in style breathers; Designed to work with Fabricated Sheet Metal and Cast Aluminum Valve Covers, with out logo, that have a 1.22 in diameterhole and a materail thickness of .90" - .100". Ideal for aftermarket valve covers wtih out OEM -style oil control baffles. Works with all popular GM PCV valves. Special design keeps oil out of the PCV valve. Will not clear stud girdles. Made from oil-resistant rubber, 2 per pack • Designed to work with Fabricated Sheet Metal and Cast Aluminum Valve Covers, without logo, that have a 1-1/4" diameter hole • Ideal for those using aftermarket valve covers without OEM-style oil control baffles • Ideally suited for push-in style breather systems • Will not clear stud girdles • Made from oil resistant rubber