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Debris around the standpipe O-ring or a damaged lateral can replicate the same poor-filtration symptoms as a failed diffuser — addressing everything in one service visit saves you from opening the tank again
WF series — Verify fitment before ordering Pentair WhisperFlo Pump — WhisperFlo Series WFET-4 Plastic black Cam & Ramp clamp
of Thio-Trine will neutralize 1 ppm of chlorine or bromine in 10
171/4” centerline mounting distance
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Pentair Air Orifice Kit | MasterTemp 400 | 77707-0113 Control System Parts Debris around the standpipe O-ringThe Pentair Air Orifice Kit (77707 0113) is the OEM replacement air orifice assembly for the MasterTemp 400 gas heater, covering both natural gas (400NA) and liquid propane (400LP) configurations. IMPORTANT: KIT LISTING INCLUDES ITEMS 6 AND 7 This listing is a kit, not a single orifice. It includes Item Nos. 6 and 7 from the MasterTemp 400 exploded parts diagram. Confirm both components are required before ordering. IMPORTANT: HEATER COMPONENT
