# Model TR-88 Manual Transfer Pump

The TR-88 is a hand-operated diaphragm pump intended for moving potable water
between storage containers where no power is available.

## Specifications

- Rated flow: **4.5 liters per minute** at 60 strokes per minute
- Maximum suction lift: **6.5 meters**
- Wetted materials: polypropylene body, EPDM diaphragm, stainless steel hardware
- Dry weight: 1.9 kg
- Inlet and outlet: 25 mm barbed

## Maintenance

Replace the EPDM diaphragm every **500 operating hours** or every three years,
whichever comes first. The diaphragm is the only wear part that will strand the
pump; everything else degrades gracefully.

Flush with clean water after every use. The TR-88 tolerates silty water but the
check valves will stick if sediment is allowed to dry inside the chambers.

## Known limitation

The TR-88 must not be used with any fluid above **40°C**. The EPDM diaphragm
softens above that point and will deform permanently against the seat, after
which the pump will not hold prime.

## Spares kit

The TR-88 spares kit, part number **TR88-SK2**, contains two diaphragms, a set of
four check valve umbrellas, and two barb O-rings.