Speck Pumps A91 Pump Union NPT [w/o Adapter] (2500300913) mermade and this Maytronics Dolphin magenta

and this Maytronics Dolphin magenta version uses the 6101640 reference

The multiple cartridge references give this part practical value because replacement accuracy depends on matching known identifiers to the intended canister

Valve cover for compatible Jacuzzi DVK7 valve applications

and TSPA applications using the 9920-400178 reference

Speck Pumps A91 Pump Union NPT [w/o Adapter] (2500300913) mermade and this Maytronics Dolphin magentaThe Speck Pumps A91 Pump Union NPT without Adapter (2500300913) is a replacement union fitting for compatible Speck pump installations that use an NPT style connection. This part is used where the union connection needs to be restored, replaced, or rebuilt without including the adapter. It can help address issues caused by cracked fittings, worn threads, missing parts, or leaking pump connections. A properly functioning pump union is essential for