ARO 637309-GG Nitrile Diaphragm Pump Repair Kit

Nitrile is the material throughout the ARO 637309-GG: the specs list nitrile for both diaphragm and balls. Nitrile, also called Buna-N, is a synthetic rubber widely used with oils, fuels and other petroleum-based fluids, which makes this kit a natural fit for pumps moving those products.

Two catalog items are linked to this kit, the ARO 93358-2 nitrile ball and the ARO Y325-237 O-ring. Each can be ordered on its own when only one piece needs replacing, for example a single ball that has swelled while the diaphragm is still sound.

When to Use This Kit

• The diaphragm has cracked, swollen or torn, or product is escaping through the air exhaust.
• Suction lift has dropped and the pump takes longer to prime.
• Nitrile balls have hardened, swelled or worn out of round.

Fits These ARO Pumps

The 637309-GG appears in the parts lists of these three pumps:

• ARO PD20A-ACP-HGG-B
• ARO PD20A-BSS-GGG-B
• ARO PD20Y-ACS-GGG-B