This is a genuine OEM Rolair 131B Conrader BG-series BG1-M air compressor pilot unloader valve preset for 110-135 PSI. The 131B is designed as a direct factory replacement for select Rolair gas and electric constant-run air compressor models.
Key Features:
• Tank Connection: 1/4" Male NPT Threads (connects to compressor tank)
• Unloader Port: 1/4" Female NPT Threads (for unloader line connection)
• Throttle Control Port: 1/8" Female NPT (optional use for throttle control)
• Cut-In Pressure: 110 PSI
• Cut-Out Pressure: 135 PSI
• Durable Brass Construction: Built for corrosion resistance and long service life
• Easy Installation: Standard connection sizes allow direct replacement
The valve features a 1/4" Male NPT thread for the tank connection and a 1/4" Female NPT unloader port for the unloader line. It also includes an optional 1/8" Female NPT throttle control port for engine idle control on gas-powered compressors. The valve is factory preset to activate the compressor at 110 PSI cut-in and shut it off at 135 PSI cut-out, supporting proper pressure regulation and reliable system operation.
It is suitable for compressor systems up to approximately 20 CFM and performs multiple functions, including pressure management, pump head unloading, and throttle control activation.
Compatible Rolair Air Compressor Models:
• 3095K18CS
• 3230K30CS
• 4090HK17
• 5230K30CS
• 5520K17CS
• 5715K17CS
• 6590HK18
• 6820K17CS
• 7722HK28
• 8230HK30
• 8422HK30
• 5GR30HK17
• 11GR Series
• 13GR Series
• 18GR Series
• 5GR Series
• GD4000PV5H
• GD4500PV5R
This valve is commonly referenced under manufacturer part numbers BG1-M-110, 131BIG, 131B, BG1-M-110-135, and alternate SKU BG1M95125, with UPC references including 685650076638 and 795525334197. Jenny 141-1064, Dewalt 5131609-00, and Emglo PVMA are also common alternative part numbers. Other brands include Quincy and J-Air.
