1" PVC Coupler
1" to 3/4" PVC reducing bushing
1/4" OD, 1/8" ID vinyl tubing, about 8" for good measure.
A small section of 1/4" ID tubing as a coupler, or a nifty brass/PVC barbed fitting.
3/4" to 1/2" PVC slip fitting. I only buy the ones at Lowe's, they're meant for 4Bs.
The new pump. I use Schwinn typically. This writeup shows a MS pump.
Super Glue. I use Gorilla brand.
Oatey's red can PVC/CPVC/ABS cement. I put that shit on everything.
Let's get started. Here is the blaster.
Open it up via the 10 screws. If you're going to minimize this thing just hack, gouge or chew your way through the orange ring at the front of the blaster. If you're going to keep it intact, be a bit more careful(or buy an intact ring from me, I've been saving them).
See these pieces?
Get rid of them. You'll end up with this after using your hacksaw or razor saw:
Debur those edges, you don't want chunks of plastic in your airtank later. Now that our tank has gone on a diet, let's get it ready for its new pump. Here's the rear of the tank before and after removing the stock check valve:
Sorry, no bonus points for a pretty circular hole here.
Now, drill a hole near the front of the tank. I use a 1/4" drill bit for my favorite 1/4" OD, 1/8" ID tubing, and always make the hole forward-facing and oriented toward the "bottom" shell of the blaster. Debur this hole as well.
Take the opportunity now to do a final deburring of all holes and cuts we made in the tank. Rinse it thoroughly with water, running your faucet or bottled water into the nozzle of the tank(which you should be holding OPEN, derp), and letting the water exit the rear of the tank where you cut-out the stock check valve. Shrapnel in your airtank is bad, mmk?
Let's relocate that OPRV. After much trial and error, I've settled on my favorite method. The stock OPRV is in the pump head, as with many nerfy air blasters. Cut off the pump shaft 1/2" or so above the pump head. Discard the pump handle, unless you have some other use for it. Remove the oring from the pump head(OPRV, for our purposes) and toss it in the parts bin or garbage.
Test-fit this assembly into the rear of our 1" to 3/4" bushing. It needs to go through in this manner for strength. If it doesn't fit through the bushing easily, trim the bushing's rim until it does. Super glue it to the bushing, being careful to not plug the two holes in opposite sides of the OPRV. Once it has cured, Goop the living hell out of the rear portion, being careful to not plug the hole on the bottom of the OPRV(I super glue a portion of larger vinyl tubing around the hole to build a wall).
Here's your end result:
Edited by BrokenSVT, 01 December 2010 - 11:48 PM.