The Castair IP2 is a genuine Castair replacement 2-inch inspection plug for cast iron air compressor pumps. This is the access plug used to service or inspect the lower crankcase on Castair pump models — specifically the crankcase oil drain/inspection port that allows you to check internal pump condition, drain used oil, and verify that the crankcase is properly sealed during maintenance intervals. Price is $22.33 each.
If you're doing a scheduled oil change, found an oil leak at the crankcase plug location, or need to reseal the inspection port, this is the OEM replacement part. Castair manufactures cast iron pumps with standard thread inspection plugs, and using the correct Castair replacement ensures proper sealing and thread compatibility.
When You Need This Part
- Scheduled oil changes: The inspection plug is removed to drain the crankcase oil on Castair pumps. If the existing plug is showing thread wear, corrosion, or sealing issues after repeated removals, replace it at the next oil change
- Oil leak at plug location: If you see oil weeping from the crankcase plug area, the plug threads or sealing surface may be worn — replace the plug before the leak worsens
- Pump disassembly: When rebuilding or servicing a Castair pump, replacing the inspection plug with a new OEM part ensures a properly sealed crankcase when reassembled
- Thread damage: Cross-threaded or stripped plug ports require a new plug and often a thread repair — replacing the plug is the first step
Part Details
- Part Number: IP2
- Thread Size: 2 inch
- Type: Crankcase inspection / drain plug
- Material: Compatible with cast iron pump crankcases
- Application: Castair cast iron compressor pumps
Compatible Pump Models
The IP2 inspection plug is a Castair major component part — call us at 866-217-0063 to confirm compatibility with your specific Castair pump model (C1, C2, C3, VA80, PUK65, or other pump models). Castair uses standard plug sizes across several pump families, but confirming the correct part for your pump before ordering prevents a return trip.
Castair Pump Oil Change Schedule
Castair recommends checking and changing compressor oil regularly as part of scheduled maintenance. Standard practice:
- Check oil level at the sight glass before each use — low oil is a common cause of accelerated pump wear
- Change oil after the first 50 hours on a new pump, then every 500 hours or annually — whichever comes first
- Use Castair-recommended compressor oil (available separately — see Castair oil products)
- Inspect the drain plug threads and sealing surface at each oil change — replace the IP2 plug if threads show wear or if re-torquing does not stop a seep
Technical Specifications
- Part Number: IP2
- Description: Replacement 2 inch inspection plug
- Application: Castair cast iron compressor pumps
- Category: Major Components
Why Buy From Air Compressor Factory Direct?
We stock genuine Castair parts and components. If you're not sure whether the IP2 is the right inspection plug for your specific pump model, call us before ordering. We've been supporting Castair equipment since 2016, and our team can cross-reference your pump model to the correct plug size and thread specification. Free shipping is available on orders meeting our threshold. Call 866-217-0063 for parts confirmation and ordering help.
Call 866-217-0063 for quick answers and help!
