Tuf-Lok / Ring Grip / Series 688

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The Tuf-Lok ring grip pipe coupling is a rugged, heavy duty, self-aligning and self-grounded pipe coupling with a high end pull for almost any application where pipe ends need to be connected.

Features: Self-aligning Installs quickly High end pull High pressure rated Full vacuum rated Reusable Absorbs vibration Rigid Usable on thin or thick wall pipe Low cost Externally leakproof Self grounding Smooth internal connection Every coupling a union

Options: Covers - Mild steel - Zinc plated - Stainless steel Rings - Mild steel - Stainless steel - Aluminum Custom gaskets - EPDM - Buna-N - Silicone - Fluoroelastomer - Others High temperature design to 350° F (176° C)

Nom. Pipe Size (in.)	Pipe O.D. (in.)	Series Number	Maximum W. P. (psig)	Maximum End Load* (lbs)	Dimensions (in.)			Approximate Weight Ea. (lbs)
					A	B	C
2	2.375	688	150	4600	4.26	3.45	4.14	2.3
3	3.500	688	150	6300	5.38	4.57	4.14	2.9
4	4.500	688	150	7600	6.37	5.57	4.14	3.6
5	5.563	688	150	9000	7.42	6.63	4.14	4.3
6	6.625	688	150	10100	8.49	7.69	4.14	4.9
8	8.625	688	130	12400	10.49	9.70	4.14	6.4

* Working pressure and end load are total, including equivalent loads based on proper coupling assembly.