Schedule 40 standard bulkhead hole size chart:

• 1″ S X S Black (Hole Size 1 3/4″)
• 1 1/2″ T X S Black (Hole Size 2 3/8″)
• 1/2″ T X T Black (Hole Size 1 1/8″)
• 3/4″ T X T Black (Hole Size 11/2″)
• 1″ T X T Black (Hole Size 1 3/4″)
• 1 1/2″ T X T Black (Hole Size 2 3/8″)
• 1″ S x T Black (Hole Size 1 3/4″)
• 1 1/2″ x SS Black Hole Size 2 3/8″)
• 2″ SxS Black ( Hole Size 3″)