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Brass 3 Part Union Fitting for pumps hoses, & pipework. BSP thread.
3 part union fittings UK Supplier All Pumps Direct UK
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A union is similar to a coupling, except it is designed to allow quick and convenient disconnection of pipes for maintenance or fixture replacement. While a coupling would require either solvent welding or being able to rotate all the pipes adjacent as with a threaded coupling, a union provides a simple nut transition, allowing easy release at any time.