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Boyd 3.0" NPSM Loose CNC Machined Aluminum Cap

Boyd 3.0" NPSM Loose CNC Machined Aluminum Cap

Availibilty : Typically In-stock, Additional QTY's available Contact us

Low stock: 7 left


Regular price $48.75
Regular price Sale price $48.75
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Cap Vent Option

-Material =  CNC Machined 6061 ALUM
- Threads = 3” 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 3.0" NPSM Neck

Overall height when using our 3.0" NPSM Neck 1.5" Long will be 2" overall with the cap threaded all the way on.

SEE SKU # 81039 FOR THE NECK. Shop Neck Here

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.  

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Customer Reviews

Based on 2 reviews
Chad Cross
Beutiful cap - fast service

The cap is beautiful and threads so smoothly. Boyd was the only place I could find this size. Order delivery was very fast and tons of communication during the process. Thanks!

Derrick Kuo

Boyd 3.0" NPSM Loose CNC Machined Aluminum Cap