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-28mm-17662/46272Compression Equal Tee Brass - 28mmhttps://www.bes.co.uk/media/catalog/product/2/8/28-mm-imported-equal-tee-imported_min_17662_P_1.jpg7.47.4GBPInStock/Pipe Tube & Fittings/Pipe Fittings/Compression41671241424145<p style="font-size: 12.132px; letter-spacing: 0.36396px;">28 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>Unbranded00https://www.bes.co.uk/media/catalog/product/2/8/28-mm-equal-tee_min_17662_L_1.jpg5056198110835add-to-cartfacet_type:Teespecial_price:7.400000cat_multi_facet_l1:Fittingsis_on_sales:Nomore_sizes:17657,17658,17659,17660,17661,17663,17664,17665products_related:7623,9570,8199,16444,23208,7308,7389,7550,21112,19494,23366sku:17662FittingsTeeNo17657,17658,17659,17660,17661,17663,17664,176657623,9570,8199,16444,23208,7308,7389,7550,21112,19494,23366176627.400000No{"Type":"Tee"}EqualUnbranded28 mm28 mm28 mmBrassMetric28 mm