How to identify a Lowara SV/e-SV plug: drain, fill or connection port

A plug on a Lowara SV or e-SV pump cannot be identified safely by shape alone. The documentation distinguishes drain and fill plugs on the SV8, but the e-SV installation manual also refers to plugs that cover the pump ports before the pipework is connected .

The practical test is therefore: which exact pump series is it, where is the plug located, and what does that opening serve?

Documented plug references for a Lowara SV8

If the pump is definitely a Lowara SV8 and the plug matches the SV8 spare-parts documentation, two plug references are listed explicitly .

Plug function	Documented description	Part number
Drain	Drain plug with O-ring	140170160
Fill	Fill plug with O-ring	140170150

These are strong references for an SV8. They should not, however, be treated as universal Lowara SV/e-SV numbers. The cited parts sheet is for the SV8 series; it does not prove that the same numbers apply across every SV or e-SV variant .

Why a close-up photo can mislead

A tight photo of the plug may hide the most important clue: its position on the pump.

For e-SV pumps, the installation manual instructs installers to remove the plugs covering the ports before aligning the pump and pipe flanges and fastening the pipework . So a plug seen near a side opening, flange or connection point may be a temporary or service port cover rather than a drain or fill plug.

The e-SV technical documentation also refers to fill/drain plugs and, depending on the component or version, fill/drain/air plugs . It also notes that a second plug is available for the 10SV, 15SV and 22SV series . In short, the outside appearance is not enough; the plug’s location on the pump body matters.

A reliable way to identify the plug

Start with the nameplate. Confirm the exact model and series before ordering parts or removing anything.

If the pump is an SV8, compare the plug position with the SV8 parts documentation. In that documentation, 140170160 is the drain plug with O-ring, and 140170150 is the fill plug with O-ring .

If the pump is an e-SV or another SV variant, use a wider photo or inspection view that shows the pump body, flanges, ports and the plug position. That wider context helps distinguish a service plug from a plug covering a connection port, which is specifically described in the e-SV manual . For non-SV8 models, compare the part with the documentation for that exact series because plug arrangements can vary by version .

Safety before loosening any plug

Do not loosen or remove a plug until the pump is made safe. Lowara e-SV safety guidance says to check that the power supply is disconnected and that the unit, control panel and auxiliary control circuit cannot restart, even accidentally, before work begins .

That check should come before inspection, draining, venting or part removal.

Practical takeaway

For a confirmed Lowara SV8, check these two documented references first: 140170160 for the drain plug with O-ring and 140170150 for the fill plug with O-ring .

For any other SV/e-SV pump, or when the photo does not clearly show the nameplate and plug location, keep the identification conditional. Confirm the exact model, then match the plug’s position and function against the correct parts documentation.