3/4 Inch Vented Loop - Jabsco part 29015-0000 An essential safety component on all inlet and discharge pipework of toilets installed below the static or heeled waterline. Simple valve system ensures water cannot syphon over pipework loops. 19mm (3/4") i.d. hose. Part Number 29015-0000 Internal valve avoids the need for external venting. Mould in tough, corrsion proof Marelon.