High Flow HDPE Waterproof Vented Cap D17 For Agricultural Chemical Bulk

The D17 high-flow waterproof vent is the definitive pressure management device for agricultural chemical bulk containers, including returnable shuttle tanks, on-farm storage vessels, and high-volume nurse tanks. This vent features the largest practical ePTFE membrane within a 17mm form factor, optimized to deliver superior airflow rates exceeding 2000 ml/min at minimal pressure drop. Its heavy-duty, UV-stabilized HDPE body is built for decades of agricultural service, resisting sun, rain, and chemical attack. By providing industrial-grade breathing capacity, this vent allows bulk containers to be filled and emptied at maximum pump speeds without stress, while ensuring that rainwater, crop debris, insects, and liquid chemicals never cross the barrier in either direction.

Agricultural bulk containers serve as the backbone of modern farming’s chemical logistics. They are refilled and transported repeatedly, often sitting outdoors in direct sun and rain. High-capacity pumps used to transfer liquid fertilizer or pesticides can move hundreds of liters per minute, demanding an equally high volume of makeup air to prevent vacuum damage. If the vent cannot match the pump’s displacement rate, the container buckles, seams crack, or the pump cavitates, leading to inefficiency and equipment damage. Non-breathable or poorly vented tanks sweat moisture internally and can become breeding grounds for mold and bacteria if condensation cannot escape. Leaking vents contaminate the soil and represent a direct environmental violation.

The D17 high-flow vent is the answer to these extreme demands. Its maximized membrane surface area, configured within the 17mm mounting diameter, provides breathing capacity that keeps pace with the fastest transfer pumps. The HDPE body is engineered with thick walls and high-tensile strength to endure the physical knocks of farm use. Its waterproof, dust-proof ePTFE membrane guarantees that no rain enters the tank when a storm rolls in, and no chemical drips out during transport across fields. The UV-stabilized formulation of the HDPE ensures the vent does not chalk, crack, or embrittle under years of sun exposure, providing a fit-and-forget solution for agricultural chemical bulk storage.

• Liquid fertilizer shuttle and returnable containers
• Large on-farm pesticide and chemical storage tanks
• Nurse tanks for sprayer tendering
• Agricultural aviation bulk chemical handling tanks
• Cooperative and retail chemical depot storage vessels
• High-volume fertigation stock tanks

The vent utilizes a purpose-designed, large-area ePTFE membrane that minimizes pressure drop at extreme airflow rates. When a 500 L/min pump empties a tank, the vent simultaneously admits an equivalent volume of air through its billions of open nanopores, preventing any measurable vacuum. The membrane's inherent waterproof property and IP68-rated sealing stop water ingress even if the vent is temporarily submerged during a heavy downpour. The UV-stabilized HDPE housing protects the membrane and ensures the entire assembly remains structurally sound and fully functional after years of direct outdoor exposure.

1. Calculate maximum transfer pump rate: select this vent when your pump rate requires the highest airflow in the D17 range.
2. Evaluate UV exposure: this vent is explicitly designed for outdoor use. If your container is stored indoors, the standard D17 HDPE vent is also suitable.
3. Confirm installation method: for existing tanks, threaded adaptors allow easy retrofit. For new tank construction, welding provides the most integrated solution.
4. For tanks that may see internal pressures exceeding typical head pressures, contact our team for customized pressure relief settings.

• Q: How many of these vents do I need for a 5000L bulk tank?
  A: The number depends on the pump flow rate. For a single high-flow pump, one D17 vent is often sufficient for up to 2000L. For larger tanks or multiple pumps, we can calculate the required number.
• Q: Will prolonged UV exposure eventually degrade the ePTFE membrane?
  A: ePTFE is inherently UV-resistant. The HDPE body contains advanced UV stabilizers. Together, they are rated for a decade or more of outdoor service.
• Q: Can this vent be cleaned if covered in dust or pesticide overspray?
  A: Yes, the outer surface can be gently rinsed with water. The waterproof membrane will prevent any cleaning water from entering the tank.
• Q: Is the vent safe for use with anhydrous ammonia tanks?
  A: Anhydrous ammonia is a specialized application requiring specific materials and pressure ratings. Please contact us to discuss your exact specifications.
• Q: Does the high airflow cause excessive evaporation of my stored chemical?
  A: The vent breathes only in response to pressure differentials. Once pressure is equalized, airflow effectively stops, minimizing any vapor loss to the necessary minimum.