Castair SA100x4M — 1" Intake Noise Silencer, 4-Pack Mounted
The Castair SA100x4M is a 4-pack of 1-inch intake noise silencers, sold pre-mounted and ready to install. This is the correct purchase for shops outfitting multiple compressors simultaneously, facilities maintaining a fleet of Cast Air machines, or duplex and tandem compressor installations that require silencers across multiple intake ports at once.
Each unit in the SA100x4M pack is a 1-inch NPT silencer — the same acoustic performance as the single SA100, delivered in a volume quantity with factory-mounted hardware. Instead of ordering four individual silencers and sourcing mounting hardware separately, you get four fully assembled units in one order at fleet pricing.
Key Features
- 1-Inch NPT Intake Port: Fits compressor pumps with a 1-inch air intake fitting — confirm your pump intake port size before ordering
- 4-Pack Quantity: Four silencers per order — suitable for multi-compressor installations, duplex units with four total intake ports, or facility-level stocking
- Mounted Configuration: Pre-assembled with hardware — arrive ready to bolt on, no additional fabrication required
- Intake Pulse Damping: Internal acoustic baffling on each unit reduces intake noise on every compression stroke across all four ports
- No Airflow Restriction: Does not reduce pump output when filter elements are clean — sized for full intake volume at 1-inch port diameter
- Cast Air OEM Specification: Designed for Castair pump intake ports at 1-inch diameter
- Serviceable: Inspect and replace filter elements in all four units periodically to maintain airflow and noise reduction performance
Technical Specifications
- Part Number: SA100x4M
- Intake Port Size: 1-inch NPT
- Quantity: 4 silencers, factory mounted
- Type: Compressor intake noise silencer, 4-pack
- Manufacturer: Cast Air (Castair)
- Price: $1,030.92
Where the SA100x4M Fits in the Silencer Lineup
- SA100 — Single silencer, unmounted ($118.58)
- SA100M (C1) — Single silencer, mounted for C1 single-intake pumps ($144.95)
- SA100x2M (C2, C3) — 2-pack, mounted for C2/C3 dual-intake configurations ($289.99)
- SA100x4M — 4-pack, mounted, for multi-compressor facilities ($1,030.92). This product.
Typical Applications for the SA100x4M
- Outfitting a multi-bay shop with four separate compressor stations simultaneously
- Fleet maintenance facilities running four or more Cast Air compressors requiring intake noise upgrades
- Duplex compressor installations with four total intake ports across two pump assemblies
- Facility-level noise compliance — reducing compressor intake sound in customer-adjacent or office-adjacent areas
- Stocking replacements for a facility with four existing Castair units to have spares on hand when originals need replacement
Why Buy From Air Compressor Factory Direct?
- Authorized Cast Air dealer since 1991
- Free shipping on qualifying orders
- Free technical support at 866-217-0063 — we can confirm the SA100x4M's 1-inch intake size matches your specific pump models before you order a 4-pack
- Full manufacturer warranty on every Cast Air accessory
Call 866-217-0063 for quick answers and help!
