Make sure you get 2, one for resin and one for hardener. We include a 1/2 stroke limiting "clip" with one pump which is used in the hardner container. The means you'll automatically get the correct 2:1 ratio (resin:hardener) when you pump ONCE from each pump. A full stroke dispences 1 oz of material.
Compatability/sizing: The top of our jugs have openings which are are 1 1/4" I.D. and 1 3/8" O.D. The caps that go onto the jugs measure 1 7/16 ID and 1 9/16 OD.
