sac with 3 or more valves

i would like to know which companies have 3 or more fill drain valves. i was really wondering about the v-drive 350's on the market and the launch pad 440's. i know lgr's can be ordered with 3. i was wanting to use bottom valve to drain one top to fill and one as overflow and to keep air out. thanks

Straightline (Lauchpad) 680s come with 4 fill/drain ports and fit great into MC X10 rear compartments after removal of stock hard tanks. Looks like 440 Locker/bow Pad has 4 ports also.

http://www.straightlinewatersports.com/gear/launch-pads.php#840601010

if you really want a perfect fit and valves exactley where you want them, you may want to have custom sacs built. i haven;t tried these and would be eager to hear from anyone who has:
http://www.boardersparadise.com/merchant2/merchant.mvc?Screen=CTGY&Store_Code=WBS&Category_C ode=D1d

i'm thinking of ordering some of the custom sacs from there for my bow and trunk

i just got in a Fly High side seat that has three valves 2 on the back and one on the side
http://www.buywake.com/catalog/detail.lasso?cat=8&man=Fly%20High&sku=FL_Hjj2U

i was thinking it would be easier to make a custom fill and drain system with three valves. using one to fill one to drain and one as overflow and to evacuate air. i was going to go with reversable pump but presently own ttwo aerator pumps.