Source for plastic SAE -3 and -4 LP HP port plugs?

[Fibonacci]

OK got the sizing info from Caplugs... many thanks to @broncobowsher

T2 for LP ports
T3 for HP ports

T3X for LP hose ends
T4X for HP hose ends

Caplugs also have an Australian distributor Weldalloy in QLD, who will sell them in bags of 100 vs 1,000 in the US catalogue

https://weldalloy.com/wp-content/uploads/2019/03/caplugs_catalog-01.pdf

 

[Tracy]

I don't know about threaded plugs.
I used silicone powdercoating plugs. They are tapered and cost basically nothing.
In the US, you can get a large assortment on amazon for $20.

 

[Zef]

If its just for storage and keeping dust out of the 1st stage, then why not just take some plastic kitchen wrap (saran wrap) and wrap the 1st stage with it. It is transparent and will effectively keep dust and critters out of your 1st stage. Inexpensive, readily available, and effective.

-Z

 

[herman]

Just put them in plastic sandwich bags, squeeze the air out and put a rubber band around them.

 

[SlugLife]

I don't know about threaded plugs.
I used silicone powdercoating plugs. They are tapered and cost basically nothing.
In the US, you can get a large assortment on amazon for $20.
View attachment 754842

I could actually use some of these for another DIY project!