Sirem

Sirem spa pump parts and seals

Sirem circulation pumps are a familiar sight inside spas, whirlpool baths and small filtration circuits, where a compact motor and wet end run for long hours at modest flow rates. Because the motor itself usually outlives everything around it, the parts that actually come up for replacement are the sealing components between the wet end and the dry side: the faceplate O-ring and the mechanical shaft seal. Here you will find those service items listed by their original reference numbers, so that an existing pump can be put back into service rather than replaced in full.

Zakres oferty

The parts listed on this page are wet end service components rather than complete pumps. They are the items that come out of an exploded view when a circulation pump starts to weep, drip onto the base of the spa cabinet, or lose prime after a winter standing still.

• Faceplate O-ring (4111420035) — the static seal that sits between the pump housing and the faceplate or motor bracket on SIREM spa pumps, keeping water inside the volute.
• Wet end seal (4200161101E) — the rotating mechanical seal for SIREM PB pumps fitted with a Ø 16 mm impeller, sealing the shaft where it passes from the wet end into the motor.

Between them, these two references cover the two different ways a small circulation pump leaks: past a flat, compressed joint, or along the shaft. Knowing which of the two is happening usually tells you which part to order.

How to tell which part you need

Mechanical seals and housing O-rings fail in recognisably different ways, so a short inspection before ordering saves a second order later.

• Water tracking along the shaft — a steady drip appearing from the gap between the wet end and the motor, often with a faint squeal on start-up, points to the mechanical shaft seal rather than the housing joint.
• A weep at the joint line — moisture or a white, dried deposit following the seam where the faceplate meets the housing points to the O-ring, particularly if the pump has been opened before for cleaning.
• Model and series — check the motor label and the casting for the series marking. The 4200161101E seal is specified for PB pumps, so confirm the series before ordering.
• Impeller diameter — the Ø 16 mm figure quoted with the wet end seal identifies the fitment. Measure or compare against the old part rather than assuming, as the same pump family can appear in more than one build.
• Measure the old seal — with the pump drained and the faceplate off, measure the O-ring cross-section and inside diameter with a vernier caliper, and note the outside diameter of the seal’s rotating face. Comparing those figures against the part you receive is the quickest confirmation of a match.

Working on a spa circulation pump

Isolate the supply at the consumer unit and close any isolating valves or gate valves before loosening unions, then let the pump drain fully — spa pipework holds more water than it looks. Keep the screws and the faceplate in the order they came off, and photograph the assembly before separating the wet end, which makes reassembly around an exploded view far easier.

Mechanical seals are supplied as a matched pair of faces and should be handled by the edges only; a fingerprint or a grain of grit on a lapped face is enough to cause a slow weep. Fit the seal dry or with a little water as recommended for the seal type, never with oil or silicone on the running faces, and replace the housing O-ring at the same time while the pump is apart. Rinse the volute and impeller of scale and debris, then refill and check carefully for leaks at the first run.

Sirem at PoolParthub.com

Here we list Sirem wet end service parts by their original reference numbers, including the 4111420035 faceplate O-ring and the 4200161101E seal for PB pumps with a Ø 16 mm impeller. Listing them by reference is deliberate: it lets the number stamped on a parts diagram or quoted by a spa technician be matched directly, without guessing from a generic size chart.

These components sit alongside our wider stock of pump seals, O-rings, unions and filtration spares for pools and spas, so a repair can usually be completed in one order. If the pump on the bench is not clearly identified, the motor label, the series marking on the housing and a measurement of the old seal will normally be enough to pin down the right part.