Hayward Bulkhead threaded ?

[Ginzo]

Hi guys,

Just wondering, your Hayward Bulkheads, are they Threaded x Threaded ?

On the picture, seems like they are Slip x Thread ?



Regards,
Chris

[Snarkys]

we have both but the ones on the site right now are slip by thread. Ill have the TxT up in a couple days.

[Ginzo]

Thanks Snarky !

I'll wait until those are on the site to pass my order

[Snarkys]

here ya go

http://www.bulkreefsupply.com/Plumbi..._32/index.html

[jnb]

Can these be installed with the flange/gasket on the outside?

[Snarkys]

while some people do that no bulkhead should be installed with the gasket on the outside.

[ViPeR_930]

Why is that? With the gasket on the outside it should still provide a watertight seal as long as the flange is also on the outside.

[jnb]

after asking this question I finally did some smarter searches and found that even some of the most experienced reefers agreed that it made no difference AND my theory is that it may be better as the water pressure won't compress the oring as much AND I went out to a site that sells the best bulkheads (as far as I know) which is Hayward - and they offer an illustration made by Hayward, which among other things offers that they can be installed either way (if you read the last sentence of it)

http://www.aquaticeco.com/index.cfm/...mages/iid/6862

Originally posted by ViPeR_930
Why is that? With the gasket on the outside it should still provide a watertight seal as long as the flange is also on the outside.

[Snarkys]

it all depends on the application . often in aquariums there is very low pressure and it might not matter. Keep in mind that just because it doesn't leak today doesn't mean it wont 3 years from now, a slow drop in an area you can't see could do some serious damage to your floors over time.

Bulkheads are designed to have the head and gasket inside the tank , any manufacturer or plumber will reiterate that. It is the water pressure inside that pushes against the head and gasket and insures the proper seal.

That said I'm sure plenty of people have had luck the installing it backwards since many overflows have little to no water pressure on them but we only recommend installing them the way they were designed to be used.

[ViPeR_930]

Gotcha

[Snarkys]

Originally posted by jnb
[B] my theory is that it may be better as the water pressure won't compress the oring as much

It is much better to have the water pressure pushing the bulkhead and gasket against the glass. If you install it backwards so the head and gasket are on the outside the water pressure is actually pushing the rubber gasket away from the glass.

Again how much this matters is highly dependant on how much water pressure you are dealing with.

[jnb]

I can not imagine that the water pressure in our tanks, even if on the bottom makes more impact then the tension on the gasket caused by tightening the bulkhead down. - even if done correctly which is not over tightening it.

The only leaks I have expereinced were not from bulkheads installed with the flange out.

I just called Hayward and discussed this - and they related that at the pressures we are talking about - it just does not make a difference - what is more important is to cut the right size hole (not bigger than called for) and not over tightening the bulkhead.

I am about to install a new sump and need the space such that I want to install the flange and want the right answer.





It is much better to have the water pressure pushing the bulkhead and gasket against the glass. If you install it backwards so the head and gasket are on the outside the water pressure is actually pushing the rubber gasket away from the glass.

Again how much this matters is highly dependant on how much water pressure you are dealing with. [/QUOTE]

[Snarkys]

looks like you found your answer : )