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Old 10-17-2012   #31
aurora, Colorado
Join Date: Mar 2006
Posts: 107
I use a 1-1/2 flapper style check valve for the hose outlet. the plunger gets its own check valve to that the o-ring can seal and not worry about acting as a check. I also have one where I used Teflon hydraulic backing rings as an o-ring. No grease no mess. For o-rings that really work well look up "quad seal". And polish your barrel. Sandpaper on an arbor backed up with foam to fill the barrel and a power drill. Go until the extrusion marks are gone

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Old 10-18-2012   #32
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Danville, California
Paddling Since: 1970
Join Date: Jun 2012
Posts: 190
Good ideas for sure. Bob Carlson has been honing his barrels (he also does it because some pvc is slightly elliptical instead of round) for quite a while. And he uses a flat washer made of polyethylene, but your idea of a teflon ring sounds better. I have noticed though that the flat-washer equipped Carlsons do not pump quite as effortlessly as when there is an O-ring on the plunger disc. But normally there is little if any lube when he has flat washers.

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barrel, cheep, homemade, pump

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