3/4" OD. 030" thick, 9/64” center hole. PPC part #759. I'm Howard Gustafson and I've been a player piano technician since 1985.
1 Player Piano Valve Disc 11/16" OD, .050" Thick, Aluminum
1 NOS Player Piano Valve Seat, Large, 1-3/4" OD, 1-5/16" ID
1 Player Piano Phenolic Valve Disc 1-3/8" OD, 1/16” ID, 3/32" Thick, Tan, Circle
1 NOS Player Piano Valve Disc, 11/16" OD, 5/32" ID, 1/16" Thick, Phenolic
1 Player Piano Phenolic Valve Disc 13/16" OD, 11/64" ID, 1/32" Thick, Circle
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