The Castair ROFD16-G30 is the OEM spin-on oil filter for Castair rotary screw compressors equipped with the D16 or G30 air end. The D16 air end is found in Castair's 50–60 HP rotary screw models; the G30 air end is used in 15–30 HP machines in the upper range of the G-series. One part number covers both air ends — if you have a D16 or G30, this is your oil filter. Automotive-style spin-on design means no housing to open, no element to handle bare-handed — just spin off, spin on, done.
Why This Filter Covers Two Air Ends
Castair's rotary screw line uses a rationalized spare parts approach — where two air ends share filter dimensions, Castair specifies a single filter part number to simplify your maintenance inventory. The ROFD16-G30 shares the same thread pitch, bypass valve rating, and element media as required by both the D16 and G30 designs. If your Castair rotary lists either D16 or G30 in the model designation or service manual, this is the correct oil filter.
Compressor Applications
- G30 air end: Castair 15–30 HP rotary screw models — e.g., R15312VG30, R15312HG30, R20312VG30, R20312HG30, R25312VG30, R25312HG30, R30312VG30, R30312HG30. Delivers 52–130 CFM @ 100 PSI depending on HP. Available in 120-gallon vertical or horizontal tank configurations.
- D16 air end: Castair 50–60 HP rotary screw models. Larger capacity machines with higher CFM output and the same 100% duty cycle design philosophy as all Castair rotary models.
Maintenance Context
- Filter type: Spin-on, automotive-style paper element
- Part of kit: MKG30R (G30 air end) and MKD16 (D16 air end) preventative maintenance kits — each includes 2 air filters, 4 oil filters, 1 separator filter, and 5 gallons synthetic Cast-Lube oil (10% savings)
- Oil: Castair GA4000 or FG4000 synthetic rotary screw oil, rated 1 year/4,000 hours
- Service interval: Replace with each scheduled oil change per Castair maintenance schedule
- Tracking: Castair rotary screw units include an hour meter standard — use it to track your service intervals
Maintenance Kit Option
For a full service on a G30-equipped machine, consider the MKG30R kit; for D16 machines, the MKD16 kit. Both include:
- 2 × air filter elements (RAFD16 for D16; 32DP for G30)
- 4 × ROFD16-G30 oil filters (this part)
- 1 × RSFD10-16-G30 separator filter
- 5 gallons GA4000 synthetic oil
- 10% savings vs. individual purchase
Technical Specifications
- Part Number: ROFD16-G30
- Filter Type: Spin-on oil filter
- Compatible Air Ends: Castair D16, Castair G30
- Compatible Compressor HP: 15–30 HP (G30), 50–60 HP (D16)
- Manufacturer: Cast Air
Why Buy From OEM Diagnostic Tools?
OEM Castair maintenance filters shipped directly to your shop. Free shipping on qualifying orders. Free tech support at 866-217-0063. Full Castair manufacturer warranty. We can verify the correct filter for your specific model number before you order.
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