Healthways Scubair J exhaust [mushroom] valve

[USdiver1]

I have a Scubair J, circa 1962. The second stage is the downstream version with a single exhaust valve. My old exhaust valve has dry rotted to the point of disintegration, and I am looking at the Trident catalog for a silicone replacement. Does anyone know the diameter of the mushroom valve? I see 18mm , 20 mm, 22mm among others available for sale. Thanks in advance.

 

[SubseaSports]

I don't recall exact size..but mine is very small...I pulled one from a snorkel. The stem was too narrow and I had to modify.
Can be seen in this post I made about it.

 

[John C. Ratliff]

Go to Goodwill, and look over their snorkels. People buy these fancy snorkels for their vacation, then come back and donate them. A lot of times you can get a snorkel for under $2. Take a measurement of your Scubair J’s exhaust, and compare to the various snorkels you will see at Goodwill. You should be able to get a silicone mushroom for your regulator for a very reasonable price.

SeaRat