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Modding outlets on Danger Den pumps

L

lamarth

Limp Gawd
Joined
Sep 22, 2004
Messages
376
Has anyone ever modded a Danger Den 12V (mcp 650 liang) pump from a 3/4" inlet-outlet setup to a 1/2"? I can get one with a 3/4" molded-in barb cheap, and was thinking of removing the original molded plastic inlet/outlet barbs and drill and tap the openings to accept a brass 1/2" barb. However I'm wondering if the plastic is strong enough to do this with....

Thanks!
 
you might be able to drill and tap the ID of the 3/4" Brab to use 1/4" NTP i think the hole in the center might be to big for 1/4" npt but you can fill in the hole with Epoxy and the drill and tap it i have done this to mod other pumps.

I don't think the molded fitting is big enouh to run 3/8 NPT definty not 1/2" npt.

IMO the plastic is strong enough to hold barbs i have seen barbs put on water bottles so i have no doubt that the plastic will hold up.
 
That was my main concern- if the NPT threads would exert too much pressure on the plastic where it would be in danger of splitting.....

I would've thought tho that after drilling out the ID there'd be enough plastic for a 1/2" NPT, but I was wondering if after drilling out the ID to take a 1/2", I'd leave so thin a wall of plastic that I'd be at risk of splitting the wall with a NPT....

Sounds like I'd be better off probably drilling out the ID but maybe epoxying a 1/2 plastic barb in it's place- as opposed to tapping and using a NPT barb?
 
a 1/2" npt barb needs to be drilled with a 45/64 drill bit (0.703") if the barb on the pump is 3/4" (.75") that would only leave .05 wall on the barb i don't think i would trust that as being strong enough
however 3/8 NPT is drilled with 9/16" (0.562") that would leave almost 3/16" (0.188")
 
jeclone said:
a 1/2" npt barb needs to be drilled with a 45/64 drill bit (0.703") if the barb on the pump is 3/4" (.75") that would only leave .05 wall on the barb i don't think i would trust that as being strong enough
however 3/8 NPT is drilled with 9/16" (0.562") that would leave almost 3/16" (0.188")
Click to expand...
Yea that's what I was afraid of- that's way too thin for my liking, too.

I could heat up the hose and stretch it over the end - but is Tygon flexible enough where it can do that and not split later on down the line?
 
I've done it pretty regularly and never had a tube split. I don't think I've even read about anyone having it split. A big stretch like that is easier to do in stages - warm it up, stick it on a 5/8" barb, let it sit for a day, then heat it up and jam it on the big one.
 
Ok- it can be done then w/o damaging the hose- just need to work it up to that diameter. Thanks!
 
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