metal vs. plastic

[StirCrazy]

go with a plastic gate valve if you can find one a plastic ball valve if you can't.

Steve

[Delphinus]

I don't think there's any real harm in reducing to 1-1/4" but I don't think you'll save anything significant. I'll bet the difference in cost to be no more than a couple dollars. 1-1/2" might be easier to find.

I run my PM-1 beckett off a mag18 with 1" hose. I actually recommend you don't step down the tube diameter for the pump to injector line as it is surprising how restrictive it can be.

The flow through a tube increases four-fold when you just double the diameter. I.e., a 1" tube can carry 4x the flow of a 1/2" tube. And so on.

[danny zubot]

Is the input of the injector on yours 1 inch? Mine is only half inch. Do you think I should change the bits to increas it to at least 3/4 inch?

[StirCrazy]

also if you are stuck finding one, I know where I can get a 1 1/4 for 2.00. don't know how much shipping would be but check out the prices there and let me know. I think I am going to go buy a bunch of them ranging from 1/2" to 1 1/4" so let me know.

Steve

[Delphinus]

On my current injector housing the input is 1". I think my previous injector housing had a 3/4" input but I used a 3/4" to 1" hose barb adaptor so I could still use the 1" hose.

If it's easy to swap the bits over to make it 3/4" or even 1" then I would probably do so. If you want to experiment and leave it as-is and try it, I would guess that although the smaller input would be somewhat restrictive, it would be not as restrictive as having the smaller diameter hose down all the way to the pump.

[Delphinus]

$2 Stircrazy? Wow at that price I'd buy them all. What's the deal, are they used or something?

[StirCrazy]

Originally Posted by Delphinus

$2 Stircrazy? Wow at that price I'd buy them all. What's the deal, are they used or something?

nope old stock and they are dropping the product line. I got a couple 1" for my skimmer so I can shut off each Beckett/mazzei individually and I got two 1/2" ones to control the air to the mazzeis. but I am thinking of stock piling a bunch for future skimmer and reactor builds.

Steve

[Delphinus]

These are gate valves or ball valves?

[StirCrazy]

Originally Posted by Delphinus

These are gate valves or ball valves?

full gate valves.

Steve

[danny zubot]

Thanks Tony.