4x40 End cap Oring size

[hunterhunter111]

Does anyone know the internal oring size on a 4x40 housing end cap. I have searched and it doesn't seem to be a popular topic. I have the stainless steel housing with plastic endcaps and 1/2 inch npt ports.

[hodorskib]

I'm not sure of the size, but here is where I ordered my replacements last year. Hope it helps:
https://www.reverseosmosis.com/products/stainless-steel-membrane-housing-o-rings?variant=7188640530476&country=US&currency=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&srsltid=AfmBOoqcZ7YItREg92J-VcfNPesIXBZQdMJNOzEi-9wsGCwb0jfSLxlyETA&gQT=1

[hunterhunter111]

Thanks for the link