Wally Plug (W731) The Wally Plug is a reliable, airtight fitting for sealing unused valves on Pro-X Series FatSacs. Machined in-house for quality control, it ensures a perfect fit with 3/4" BPST sac valve threads, and an O-ring at the seal point for an airtight closure. This fitting is included with all Pro-X Series sacs and is ideal for maintaining the integrity of your ballast system. Product Features: Airtight Seal: O-ring ensures leak-free closure on unused sac valves. Perfect Fit: 3/4" BPST threads for secure, dependable connection. Quality Manufacturing: Precision-machined in-house exclusively for FatSac. Essential for sealing unused ports and maximizing your ballast system’s efficiency. SHIPPING IS NOT INCLUDED ON ANY FITTING or HOSE ONLY ORDERS UNDER $50.00If you order fittings only and your order total is under $50.00, we will contact you for a $10.00 shipping fee if shipping in the USA. If you order fittings with a fat sac or tsunami pump, shipping is included.