Straight Line Sumo Max 750 Open Bow (Grey) Ballast Bag SUMO Seams Every SUMO sac is double welded to ensure a watertight seal. Straightline's tough SUMO Skin is overlapped and hot air welded. You can see the smooth and clean seams on the outside of every bag, and a second welding operation applies an inch wide sealing tape to the inside of every seam. SUMO Max Flow Link Valve Straight Line's new SUMO Max Flow valve is a new 1.5" diameter high flow version of the Sumo Link system. The SUMO Max Flow valve provides the same hassle-free watertight connection to your Sumo Pump, but with a massive, 50% larger intake. The Sumo Max system is 100% compatible with the classic Sumo and Big Bag ballast systems. Link Valve Straight Line's unique Link system provides a hassle-free connection to your Sumo Pump, keeping your boat dry on the inside. The Link Valve is watertight and can also be used as a convenient way to purge air from your bag. 1" NPT Valves New easy turning cap with a perfect water tight seal. Pressure tested up to 6 PSI. The 1" NPT ports allow built-in ballast systems to fill, drain, and vent quickly for easy operation. Sumo Seams 1" NPT Valves Sumo Ballasts | Sumo Max 750 Open Bow Ballast Grey