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-42mm-17664/46273Compression Equal Tee Brass - 42mmhttps://www.bes.co.uk/media/catalog/product/4/2/42-mm-imported-equal-tee-imported_min_17664_P_1.jpg18.1618.16GBPInStock/Pipe Tube & Fittings/Pipe Fittings/Compression41671241424145<p style="font-size: 12.132px; letter-spacing: 0.36396px;">42 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/4/2/42-mm-equal-tee_min_17664_L_1.jpg5056198110859add-to-cartfacet_type:Teespecial_price:18.160000cat_multi_facet_l1:Fittingsis_on_sales:Nomore_sizes:17657,17658,17659,17660,17661,17662,17663,17665products_related:17202,16444,23384,10138,9551,9564,9581,15240,13596,23200,7798sku:17664FittingsTeeNo17657,17658,17659,17660,17661,17662,17663,1766517202,16444,23384,10138,9551,9564,9581,15240,13596,23200,77981766418.160000No{"Type":"Tee"}EqualBESt range42 mm42 mm42 mmBrassMetric42 mm