Brass compression fittings. BS 864-2:1983 or BS EN 1254:1988. They conform to both these standards apart from marking: a fitting conforms to the standards with which it is marked.
https://www.bes.co.uk/compression-equal-tee-brass-54mm-17665/46274Compression Equal Tee Brass - 54mmhttps://www.bes.co.uk/media/catalog/product/5/4/54-mm-imported-equal-tee-imported_min_17665_P_1.jpg29.5829.58GBPInStock/Pipe Tube & Fittings/Pipe Fittings/Compression41671241424145<p style="font-size: 12.132px; letter-spacing: 0.36396px;">54 mm equal tee.</p><p style="font-size: 12.132px; letter-spacing: 0.36396px;">Brass compression fittings. BS 864-2:1983 or BS EN 1254:1988. They conform to both these standards apart from marking: a fitting conforms to the standards with which it is marked.</p>BESt range00https://www.bes.co.uk/media/catalog/product/5/4/54-mm-equal-tee_min_17665_L_1.jpg5056198110866add-to-cartfacet_type:Teespecial_price:29.580000cat_multi_facet_l1:Fittingsis_on_sales:Nomore_sizes:17657,17658,17659,17660,17661,17662,17663,17664products_related:17743,22478,16444,9574,9545,9582,9566,18898,8761,8733,8966sku:17665FittingsTeeNo17657,17658,17659,17660,17661,17662,17663,1766417743,22478,16444,9574,9545,9582,9566,18898,8761,8733,89661766529.580000No{"Type":"Tee"}EqualBESt range54 mm54 mm54 mmBrassMetric54 mm