I just wanted new washers for my Job Supply/Tractor Supply brand but I cannot find washers.
I use these seals:
https://www.amazon.com/gp/product/B085TL6XSD/?tag=atomicindus08-20
They're for 1/4" couplers, I don't know if they offer them for 3/8", you could try messaging the seller. Or if your seal ain't too bad, measure it & see if you can find them at Mcmaster.
I only use those common style couplers for my leader hoses though. The couplers I use at the tools are Coilhose Pneumatics 5-n-1. I love these couplers, as the name implies they can accept 5 different style ******* including high flows. Slide the bottom collar to release line pressure, then the top collar to release the ******. To insert the ****** just press in, no need to pull back on the collar & since the line pressure is released it's easy to insert a ****** (like it would be harder with high line pressure). Milton offers the same style as does HF (Merlin brand). So much easier to use & nice cause I leave the tool connected & depressurized. They're 1/4" though. Do you have to use 3/8", how about 1/4" & high flow? 1/4" will always be much easier & cheaper to find.
Don't mind the swivels, this is the only pic I have from when I took those swivels off & threw em in the trash.
Looks like Milton does offer them in 3/8", but only 2-n-1 (H & P *******). They ain't cheap though ($30). P/N S-1758
