SW2 : PENTAIR Spanner for NO10 & NO20 Housings 150295

The SW2 is the genuine Pentair spanner made for opening and closing standard No10 and No20 Heavy Duty filter housings, shaped to grip the sump firmly without slipping. WrekinWater stocks it as a direct replacement for a lost or worn original, matching the fit of Pentair's own housings exactly. It gives you the turning force needed to break a tight seal or finish a housing off snugly, without resorting to tools that were never meant for the job.

Why you might need this

• Your original Pentair spanner has been lost or misplaced.
• The housing was hand-tightened too firmly and now needs a proper tool to break the seal.
• You're replacing a cracked or worn spanner from a previous service.
• You want the correct grip to avoid cracking the sump when tightening.

Pentair No10 and No20 housings are designed to be opened and closed with a matching spanner that spreads pressure evenly around the sump's lugs. Using pliers, a strap wrench, or brute hand force instead concentrates pressure on one point, which is exactly how sumps end up cracked or ovalised. The right spanner also means less effort at each filter change, since it's shaped to give proper purchase rather than slipping off a smooth plastic surface.

WrekinWater is a family run company that's served more than 50,000 customers over 15 years from its base in Bettisfield, Shropshire, and stocks genuine Pentair parts alongside Fleck, Autotrol, Clack and Kinetico. We're rated "Excellent" on Trustpilot, so you can order this small but essential spanner with the same confidence as a full system.

How to use it

1. Isolate the water supply and relieve pressure before opening the housing.
2. Fit the spanner's lugs into the slots at the base of the housing sump.
3. Turn anticlockwise to loosen and remove the sump for a filter change.
4. Fit the new filter and hand-tighten the sump back into place.
5. Use the spanner for a firm final quarter turn - snug is enough, don't force it.
6. Restore the water supply and check the housing for leaks.