Jump to content
Sign in to follow this  
Brad B

Best sac connection

Recommended Posts

Brad B

Whats better than the waterbed connectors for connecting hose to sacs?

I went to Home Depot but they don't have anything that matches the threads in their plumbing dept.

So I did pick up some waterbed ones from a matress store but I wonder how long they will last and how leakproof they are.

Mainly concerned with a bottom valve of the sac connection not leaking.

Share this post


Link to post
Share on other sites
WakeGirl

I used a barbed fitting that clamps inside of the sack that adapts to the right size for the hoses that you're using. If they don't have the right size, a plumbing store would have or be able to get whatever you need.

Share this post


Link to post
Share on other sites
whiteVLX

I was able to find some clear tubing that fit correctly inside the valve on my sack. Then it's just adding a rubber coated hose clamp to secure it.

Share this post


Link to post
Share on other sites
SacRiverRat

Huh - for some reason I was hoping this topic was about me.. :(

Anyway Brad, were you able to try the hose fittings? Mine fit tight. Also, for the lower port, are you just connecting the pump to it? I just stuck the pump (stock) into the fitting, and secured with a band clamp - no leaks

Share this post


Link to post
Share on other sites
Brad B

I didn't get much done this weekend and am still mapping out the strategy.

I think I want to connect the bottom valve to the bottom valve of an auxillary sac to go under the seats.

That way it can be drained as the main sac drains.

Share this post


Link to post
Share on other sites
Kellyb

I second what Tracie used. There are two variations:

1) Use 1" barb and hose clamp in bag.

2) Use 3/4" barb with a 3" long 3/4" hose (with 5-6 holes drilled in it) attached to the bag.

Share this post


Link to post
Share on other sites
WakeGirl

I used the 90 like Kelly shows, & then a garden hose fitting into that (actually a male to male adapter, then a female garden hose fitting - I thought that would be easier to use as a quick connect). I didn't use zip ties, but clamps instead.

Share this post


Link to post
Share on other sites
Kellyb

Yes I agree no zip ties. Also, I used the clamp on the outside of the bag on the opening of the bag. That way it sandwiches the bag opening to the fitting.

Kelly

Share this post


Link to post
Share on other sites
Brad B

Well I got it put together. Got the hard tanks out and put 440lb Launch Pads on each side of the trunk of the LSV.

I was hoping to drain from the top but the pump (with waterbed fitting) just won't quite pick up the water with some coaxing by pushing on the bag.

Will installing the drain pump on the bottom valve solve this?

Share this post


Link to post
Share on other sites
SacRiverRat
I was hoping to drain from the top but the pump (with waterbed fitting) just won't quite pick up the water with some coaxing by pushing on the bag.

Will installing the drain pump on the bottom valve solve this?

Yes... just connect the pump directly to the sack.. do you even need to use a fitting? Mine fit in the sack port, secured with a band clamp

Share this post


Link to post
Share on other sites
WakeGirl

Agree, the pressure from the water will keep it primed. Depending on the pump & whether or not you have a threaded or barbed connection to work with you may be able to go straight in to the bag like Troy said.

Share this post


Link to post
Share on other sites
Brad B

The threads on the pump are are garden hose size.

What size fits in the valve of the sac?

BTW the Launch Pad that I have does not fit the threads of the waterbed fittings - the Fly High I'm borrowing from Caleb do though.

But not too importatnt cuz I'm ditchin 'em anyway for hose clamped connections.

Share this post


Link to post
Share on other sites
WakeGirl

*I think* that if you use a waterbed adapter fitting (blue, perfect unions) then the pump will screw right into it. I just wonder about the durability of that setup. You could get a barbed fitting to go in the sack that would be clamped that adapts to a garden hose fitting, that would work. I believe the barb needs to be 1", but somebody backstop me on that because I can't remember off the top of my head (& it also might depend on the bag). If you know that the blue waterbed fittings will work & don't want to use them, you can always take one with you to Home Depot (I'd actually recommend a dedicated plumbing supply store) to get exactly what you need.

Share this post


Link to post
Share on other sites
SacRiverRat

On my 540 sacks. the stock pump fits into the sack fitting (doesn't thread) just pushes, while twisting.. into the fitting. It is a snug fit, held with the clamp

Share this post


Link to post
Share on other sites
Sunsetter95

ACE Hardware PVC garden hose connections work nicely.....

3/4" PVC fits very tight into the conection on the sac.

Share this post


Link to post
Share on other sites
whiteVLX

Is that a black zip tie I see holding the fitting to the sac? Tease2.gif

One thing I was going to try was to stick a hose down inside the bad a ways. I'm hoping the sac will drain better that way.

Edited by whiteVLX

Share this post


Link to post
Share on other sites
Sunsetter95

Yes, that is a zip tie. The tubing was so tight and they are not built in, so I didn't want anybody to cut there hand on a clamp, nor did I want to put some tape around them.

I only extended the tube about an inch or two into the sacs, again, they are not built in. I also like the tight fit of the hose connection for the fill line and for the caps.

I had thought about using a flexible line with a barbed connection, but that reduced the opening size by about 1/4" dia. As it is, my pump has a 1" line on it. The connection has a 3/4" ID, so I have already lost 1/4" in dia for the connection.

If you extended the PVC into the sac and sand the end smooth, that may work as well as a flex line. I would consider drilling some holes near the end to allow as much water as possible to get sucked out of the sac.

It was cheap also.

Share this post


Link to post
Share on other sites
Brad B

OK I got the drain pumps plumbed in the bottom valves of the 440s in my trunks.

Drains great but now have another little problem.

Bag only fills about 3/4 then water comes out of the drain thru hole - thats as much pressure as the drain pump with hose goin straight up to the fitting will stand I guess.

Whats the solution?

Ball valve?

But my goal is to operate totally from the drivers seat.

Share this post


Link to post
Share on other sites
Sunsetter95
OK I got the drain pumps plumbed in the bottom valves of the 440s in my trunks.

Drains great but now have another little problem.

Bag only fills about 3/4 then water comes out of the drain thru hole - thats as much pressure as the drain pump with hose goin straight up to the fitting will stand I guess.

Whats the solution?

Ball valve?

But my goal is to operate totally from the drivers seat.

I had this in mind when thinking about how to plumb the Fill/Drain lines.

Do you think this will work?

post-144-1115581493_thumb.jpg

Share this post


Link to post
Share on other sites
SacRiverRat

Doug, with a sack, you don't need a vent... the sac collapses when it is empty. Water goes in, it expands, water goes out, it contracts - should be minimal air in the sac with that process (how would air get in there?)

Is there a drain port at the bottom of the sack? Can you just attach the pump directly to the sack? ... that is what I did, that way there isn't any priming issues. You will need a check valve on the fill line, to keep water from siphoning back into the lake through the fill line

Share this post


Link to post
Share on other sites
Sunsetter95

That is what I was thinking. The vent would stop any siphoning from the fill side by allowing air into the fill line, breaking any siphon.

Just from filling sacs on the floor, there is always air in them. Lots of air. But then again, with a more permanent system that is basically sealed, you may not get much air in it unless it comes from the drain side.

Possibly another check valve to allow the water out, but no air in?

A friends boat has trouble with the hard tanks always over filling when he is under way. The tank bulges enough to open his hatch a little if he has a bunch of stuff in it (Super Air). Enough water cannot escape through the vent. His pumps are inline with each other flowing in opposite directions. It fills and drains from the bottom of the boat. ???

I think it would help if the sacs and tanks had another fill point at the lower section of an end. By lower meaning a fill point straight up and the end one at 6 o'clock.

I thought you were having an issue with the sacs filling all of the way?

Share this post


Link to post
Share on other sites
Brad B

I got a couple of Brady line check valves that I'm gonna try in line between the drain pumpand the output gunnel hole.

Maybe that will give just enuff resistance to keep the sacs full.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×