The Castair RSFD62-P90 is the OEM spin-on air/oil separator filter for Castair rotary screw compressors equipped with the D62 or P90 air end. These air ends are found in the 15–25 HP range of the Castair rotary screw lineup. Spin-on design matches the oil filter format — quick tool-assisted removal and installation, no housing to open or element to handle bare-handed.
Air End Coverage
- D62 air end: 15–25 HP Castair rotary screw models. The D62 is the larger variant in the D-series family, sharing the RAFD6-62 air filter with the D6 but using a different (larger) separator than the D3/D4/D6 group.
- P90 air end: 15–25 HP Castair rotary screw models. Higher-output P-series variant. Shares this separator filter with the D62.
Separator Filter Service Context
- Filter type: Spin-on air/oil separator filter
- Maintenance kit: MKD62 — D62 air end kit: 2× RAFD6-62 air filters, 4× ROFD62-P75-P90 oil filters, 1× RSFD62-P90 separator (this part), 5 gal synthetic oil — 10% savings
- Service interval: Replace at major service intervals — typically annually or at 2,000-hour intervals in normal operating environments; more frequently in dusty or high-humidity environments
- Symptom of failure: Oil carryover into downstream air lines, increased oil consumption, elevated differential pressure across the separator
- Compatible oil: GA4000 or FG4000 Castair synthetic rotary screw lubricant (1 year/4,000 hours)
Technical Specifications
- Part Number: RSFD62-P90
- Filter Type: Spin-on air/oil separator filter
- Compatible Air Ends: Castair D62, P90
- Compatible Compressor HP: 15–25 HP rotary screw models
- Companion Oil Filter: ROFD62-P75-P90
- Manufacturer: Cast Air
Why Buy From OEM Diagnostic Tools?
OEM Castair separator filters for D62 and P90 air ends. Free shipping on qualifying orders. Free tech support at 866-217-0063. Full Castair manufacturer warranty. Call us to confirm this is the correct separator for your specific machine.
Call 866-217-0063 for quick answers and help!
