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| PVDF | PA | Brass | Stainless steel | Steel | Brass chemically nickel-plated | ||||||||||
| Straight union |  |
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| Nipple connection |  |
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| Adjustable male adaptor |  |
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| Female adaptor union |  |
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| Solder/ weld-on union |  |
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| male adaptor union |  |
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| Reduction |  |
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| Panel mount union |  |
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| Tube stub |  |
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