Cap: -Material = CNC Machined 6061 T6 Aluminum - Threads = 4” NPSM Loose 8TPI -Vented= Yes/ No Based on your selection -Lanyard = Yes, Stainless Steel 8” W Alum Crossbar -Gasket = FKM VITON This Cap Will only Fit our 4.0" NPSM Neck
NOTE: THE VENTED VERSION OF THIS CAP IS SIMPLY A MACHINED GROOVE THAT BYPASSES THE GASKET IT WILL LEAK WHEN LIQUID SPLASHES AGAINST IT. It's recommended that you choose a NON Vented cap and utilize a fitting on the tank as your tank vent.
What does NPSM Loose Mean? NPSM stands for National Pipe Straight Mechanical. Loose means that we machine these on the higher end of the tolerance to account for Weld distortion to the neck and expansion and contraction throughout the seasons.
