Shurflo 94-801-10 Upper Assembly for Aqua King II 4.0 & 5.0 GPM Pumps

The Shurflo 94-801-10 is an OEM replacement upper housing assembly designed to restore full performance to Shurflo Aqua King II freshwater pressure pumps. Purpose-built for the 4148, 4158, and 4558 series pumps, this upper assembly is the correct repair solution when the housing or integrated pressure switch on your primary pump requires replacement.

This assembly includes a 55 PSI demand switch and bypass, which controls automatic pump activation and shut-off based on system pressure. Note that this part is intended for the primary pump only and does not include the valve assembly, check valve, or drive assembly — those components are sold separately.

Key Features:

• OEM Shurflo by Pentair replacement upper housing assembly
• Includes integrated 55 PSI demand switch and bypass
• Compatible with Aqua King II 4.0 GPM and 5.0 GPM pump models
• Fits 4148, 4158, and 4558 series pumps (primary pump only)
• Compatible model numbers: 4148-153-A75, 4148-153-E75, 4148-163-A75, 4148-163-E75, 4158-153-A75, 4158-153-E75, 4158-163-A75, 4158-163-E75
• Supports bench and field repair of Shurflo freshwater pump systems

What's Included: Upper housing assembly with 55 PSI demand switch and bypass. Does not include valve assembly, check valve, or drive assembly.

Shurflo's Aqua King II series is a trusted choice for marine, RV, and powersports freshwater pressure systems. Keeping genuine OEM repair parts on hand ensures consistent performance and long-term reliability for your onboard water system.