The Castair VA075 is a 3/4" NPT Male x 18" metal flex hose — the vibration-isolating connector between your compressor pump outlet and the tank inlet fitting. The 3/4" NPT size fits smaller single-stage compressors in Castair's lineup where the pump discharge port threads at 3/4" NPT. At 18 inches, this hose has the right amount of flex length to absorb pump vibration without putting bending stress on either fitting end during operation.
Why You Need a Metal Flex Hose
Running a compressor without a flex hose — or with a damaged, kinked, or work-hardened flex hose — puts vibration stress directly into hard plumbing connections. Compressor pumps vibrate both vertically and laterally during operation. A rigid pump-to-tank connection transfers that vibration into the tank fitting threads, the check valve body, and any downstream hard lines. The result over time is loosening fittings, cracked check valve bodies, and in severe cases, fatigue cracking at tank welds near the fitting. A proper metal flex hose is the correct fix.
Key Features
- 3/4" NPT Male Connection: Standard NPT thread compatible with Castair pump outlets and tank fittings in this size range
- 18" Length: Sufficient length to absorb pump movement and vibration without being so long it sags or kinks
- Stainless Steel Braided Construction: Braided stainless outer jacket over a corrugated flex tube — rated for compressed air service
- OEM Castair Part: Factory-specification replacement for Castair compressors using 3/4" NPT discharge connections
- Vibration Isolation: Decouples the pump from the tank to protect fittings, check valves, and downstream plumbing
When to Replace This Hose
- Visible corrosion, rust staining, or cracking on the braided exterior
- Kinking or permanent bending from previous installation or impact
- Air leak at either fitting end — even small leaks grow quickly under cyclic pressure
- Hose has never been replaced and the compressor has 5+ years of shop use
- Compressor has been running with a hard connection (no flex hose) and you're seeing fitting or check valve failures
Flex Hose Size Selection
Castair compressors use flex hoses in sizes from 3/4" up to 2" NPT depending on the compressor model and HP rating. The 3/4" VA075 is for smaller units. Match the hose size to your pump's discharge port thread size — an undersized hose creates a flow restriction; an oversized hose requires adapters and extra leak points. Check the pump outlet directly with a thread gauge or caliper measurement if you're unsure.
Available Configurations — Full Flex Hose Lineup
- VA075 ($59.29) — 3/4" NPT Male x 18" Metal Flex Hose (this part) — smaller single-stage compressors
- VA100 ($99.95) — 1" NPT Male x 18" Metal Flex Hose — mid-size compressors
- VA050 ($46.59) — 1-1/2" NPT x 18" Metal Flex Hose
- VA125 ($102.49) — 1-1/4" NPT x 18" Metal Flex Hose — 25-40 HP rotary units
- VA150 ($111.80) — 1-1/2" NPT Male x 18" Metal Flex Hose
- VA200 ($131.29) — 2" NPT Male x 18" Metal Flex Hose — high-capacity systems
- VA100J36 ($203.28) — 1" JIC Female/Female x 36" Metal Flex Hose — extended length, JIC fittings
What's in the Box
- 1x Castair VA075 Metal Flex Hose — 3/4" NPT Male x 18"
Technical Specifications
- Part Number: VA075
- Manufacturer: Cast Air / Castair
- Connection Type: 3/4" NPT Male on both ends
- Length: 18 inches
- Category: Ball Valves / Flex Lines
- Price: $59.29
Pressure rating and full material specifications were not available from manufacturer data at time of writing. Confirm pressure rating is suitable for your system's operating pressure before installation.
Why Buy From Air Compressor Factory Direct?
- Castair Specialist: We stock the full Castair flex hose lineup in all NPT sizes
- Free Shipping: On qualifying orders to the contiguous US
- Free Tech Support: Call 866-217-0063 if you're unsure which hose size fits your compressor — we can help confirm it in a minute
- OEM Parts: Factory-specification replacement, not a generic aftermarket substitute
- Full Manufacturer Warranty: Backed by Castair's standard warranty
Call 866-217-0063 for quick answers and help!
