This Small Cap is used on many small tanks, and coolant reservoirs.
-Material = CNC Machined 6061 ALUM
- Threads =1” NPSM Loose 11.5” TPI
-Vented= Yes/ No Based on your selection
-Lanyard = No
-Gasket = FKM Viton O-ring
This cap will only fit our 1" NPSM NECK SKU# 81070
NOTE: THE VENTED VERSION OF THIS CAP IS SIMPLY A MACHINED GROOVE THAT BYPASSES THE GASKET IT WILL LEAK WHEN LIQUID SPLASHES AGAINST IT.
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.