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Our on-line store is open 24/7 and we ship Monday through Friday, excluding some holidays. Orders received for products without shipping restrictions on its product page will ship the same business day when received before 12:00 p.m. PST. Orders in high demand will have an estimated production time listed on its product page and will ship according to the date listed.
SHURFLO's 4138 fresh water pump design was created with a unique over-molded single-piece diaphragm and internal by-pass, assuring long life and top performance in all plumbing systems. The 4138 pump is constructed for smooth flow and no rapid cycling. The 4138 fresh water automatic demand pump is quiet, thermally protected and can run dry without damage.
Features:
3901 Replacement
Sealed Switch
Sealed Motor
Corrosion Resistant Electro Coated Motor
4 Independent Chambers
Built-In Check Valve
Co-Molded Diaphragm
Adjustable Switch
Self-Priming up to 6 Feet
Dry Run Capability
Thermally Protected
Ignition Protected, CE
We are a Seattle, WA based outdoor gear store with a mission to make climbing, backpacking, skiing & mountaineering accessible and enjoyable for everyone.
© 2026, Master Store
