The difference between union and adaptor
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It seems to be all about coupling types – what’s the difference between a union male, a 1/2\" OD x 1/2\" NPT adaptor male, and a 1/2\" OD-female 1/2\" NPT (swivel) connector? What does “swivel” mean?
The biggest difference is the price – a union is much less expensive than an adapter. In terms of performance, a union is used to connect tubing and fittings that have the same thread size and thread count configurations, while an adapter is used to connect two different thread sizes and thread counts. For your information.
This post was last edited by qugd on 2012-4-14 18:02, supporting the view in the second floor. A union is simply a two-way connector ； The adapter can be a two-way connector with the same thread standard and diameter, or it can be a two-way connector with different thread standards and diameters. The poster should compare the product samples and materials to identify their similarities and differences.
Union coupling, consisting of an adaptor fitting with a female 1/2\" NPT (swivel) American-style threaded fitting – the term \"swivel\" indicates that it is a universal joint. FYI
Susuan’s explanation seems quite reliable; I agree with the person above – it’s recommended to review the entire text again to refine it