ECOTECH MARINE - S2, M2, L2 COLLAR & COUPLING KIT Ecotech Marine Sale! from 1111 /per Title Ecotech Marine Vectra S2 Collar & Coupling Kit Ecotech Marine Vectra M2 Collar & Coupling Kit Ecotech Marine Vectra L2 Collar & Coupling Kit Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Ecotech Marine S2, M2, L2 Collar & Coupling Kit for use with Vectra Gen 2 series DC controllable pumps. Ecotech Marine S2, M2, L2 Collar & Coupling Kits