Graco-KIT,MIX CHAMBER,P2,RND,AA(GC250A)
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This is not ordinary Polycarballoy and POM materials, this is an improved Polycarballoy material with higher hardness and better wear resistance. Don't worry about it being worn out.
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Graco's Fusion CS O-rings (6 pk).
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eBay
There are 12 sets Complete O-ring Kit 246355 in the box, a total of 252 pieces O-rings.
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The upgraded mix chamber and insert are a whole, which prevents mismatch between mix chamber and insert and is more convenient to use. In order to improve the durability of the Mix Chamber, we use high-strength multi-tungsten alloy materials, which are wear-resistant and will not break.
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eBay