Ridgid 35307 Set of Oil Pressure Relief is a compatable replacement part for the following machines: 300 Compact Pipe and Bolt Threading Machine, 535-A Pipe and Bolt Threading Machine, 1215 Pipe Threading Machine, 1822-I Pipe and Bolt Threading Machine, 535 Pipe and Bolt Threading Machine, 535- Manual Pipe and Bolt Threading Machine, 1233 Pipe and Bolt Threading Machine and 535 Early Style Pipe and Bolt Threading Machine.