Underhill Big Gulp Pro siphon water pump 36" suction tube, 72" outlet hose — MudGuard, heavy-duty polycarbonate

The Underhill Big Gulp Pro is a heavy-duty siphon suction pump that delivers large-volume, smooth hand pumping for fast water transfer and removal in dirty or clean conditions.

Built to stand up to tough field work, the Big Gulp Pro combines a virtually unbreakable polycarbonate body, a long 36-inch suction tube, and a 72-inch outlet hose so you can extract water from deep valve boxes, sprinklers, boats, spas, and many other wet locations. Its removable design and patented MudGuard system let it handle gritty, sediment-filled fluids without fouling the working parts, while the aircraft-grade shaft and padded handle keep each stroke efficient and comfortable.

How does this pump move so much water with each stroke?

The Big Gulp Pro is engineered for high displacement: a long clear pump cylinder and precise internal seals create large-volume intake and output on every stroke. The design emphasizes smooth action so operators can work longer without excessive fatigue.

• 36-inch clear suction tube for deep or hard-to-reach sources
• 19-ounce (per original measurement) displacement per stroke for rapid removal
• Aircraft-grade aluminum shaft and ergonomic handle for efficient power transfer

Can it handle dirty water and sediment without clogging?

Yes—the Big Gulp Pro includes a patented MudGuard system that keeps sand, silt and debris away from the pump's internal moving parts. Because the pump disassembles easily, trapped material can be removed quickly to restore full performance in the field.

• Patented MudGuard prevents grit from reaching seals and mechanisms
• Fully removable components for fast rinsing and cleaning
• Serviceable parts available to replace worn items and extend product life

What makes the construction durable enough for professional use?

Underhill designed this model with tough, work-ready materials: impact-resistant polycarbonate for the body and a corrosion-resistant aluminum pump shaft. Those choices reduce cracking and bending commonly seen with lighter, consumer-grade hand pumps.

• Polycarbonate body resists crushing and cracking in the field
• Aircraft-grade aluminum shaft minimizes flex and wear during heavy use
• Compact, portable form factor that fits truck storage or tool kits

How portable and serviceable is the Big Gulp Pro for crews on the move?

Weighing light enough to carry but built to last, the pump stores easily and can be returned to service quickly when needed. Replacement parts are available from Underhill so teams can perform field repairs rather than replace the entire unit.

• Lightweight design suitable for grounds crews and service trucks
• Quick-disassembly for cleaning between jobs or shifts
• Parts support from a USA-based company for long-term maintenance

Who this is for: The Underhill Big Gulp Pro is aimed at groundskeepers, landscapers, irrigation technicians, plumbers, marine owners, and facilities staff who need a reliable, high-volume hand pump for removing water and other fluids in dirty environments. If you require a portable, serviceable pump that keeps sediment out of critical components and delivers strong per-stroke flow, this model is designed to meet those needs.